U.S. patent application number 10/311915 was filed with the patent office on 2003-10-09 for 3-frequency branching circuit, branching circuit, and radio communication device.
Invention is credited to Ishizaki, Toshio, Matsumura, Tsutomu, Nakamura, Hiroyuki, Uriu, Kazuhide, Yamada, Toru.
Application Number | 20030189910 10/311915 |
Document ID | / |
Family ID | 27343847 |
Filed Date | 2003-10-09 |
United States Patent
Application |
20030189910 |
Kind Code |
A1 |
Yamada, Toru ; et
al. |
October 9, 2003 |
3-frequency branching circuit, branching circuit, and radio
communication device
Abstract
A 3-frequency branching circuit in the past could not be used
for a system wherein a TDMA method such as GSM and DCS and a W-CDMA
method such as UMTS are mixed. The 3-frequency branching circuit
equipped with branching means having first and second internal
terminals 21 and 22, an antenna terminal 20 of connecting to an
antenna, a low-pass filter connected between the first internal
terminal 21 and the antenna terminal 20, and a high-pass filter
connected between the second internal terminal 22 and the antenna
terminal 20, a switching circuit 1 of switching between GSMTX and
GSMRX, a switching circuit 2 of switching between DCS TX, DCS RX
and a third internal terminal 23, and a duplexer connected to the
third internal terminal 23.
Inventors: |
Yamada, Toru; (Osaka,
JP) ; Matsumura, Tsutomu; (Osaka, JP) ;
Ishizaki, Toshio; (Hyogo, JP) ; Nakamura,
Hiroyuki; (Osaka, JP) ; Uriu, Kazuhide;
(Osaka, JP) |
Correspondence
Address: |
RatnerPrestia
Suite 301 One Westlakes Berwyn
P O Box 980
Valley forge
PA
19482-0980
US
|
Family ID: |
27343847 |
Appl. No.: |
10/311915 |
Filed: |
June 4, 2003 |
PCT Filed: |
June 25, 2001 |
PCT NO: |
PCT/JP01/05414 |
Current U.S.
Class: |
370/335 ;
370/441 |
Current CPC
Class: |
H01P 1/15 20130101; H04B
1/0057 20130101; H04B 1/406 20130101; H04B 1/44 20130101; H04B
1/006 20130101; H04B 1/005 20130101 |
Class at
Publication: |
370/335 ;
370/441 |
International
Class: |
H04B 007/216 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 26, 2000 |
JP |
2000-191192 |
Dec 18, 2000 |
JP |
2000-383344 |
Mar 29, 2001 |
JP |
2001-096773 |
Claims
1. A 3-frequency branching circuit having a filter function of
passing a transmitting frequency band and a receiving frequency
band in each of first, second and third frequency bands,
comprising: first, second and third internal terminals; an antenna
terminal of connecting to an antenna; branching means having a
first filter of passing the third frequency band between said first
internal terminal and said antenna terminal and a second filter of
passing said first and second frequency bands between said second
internal terminal and said antenna terminal; a first switching
circuit, connected to said first internal terminal, of switching
between a first transmitting terminal used to transmit said third
frequency band and a first receiving terminal used to receive said
third frequency band; a second switching circuit, connected to said
second internal terminal, of switching among a second transmitting
terminal used to transmit a transmitting frequency band of said
second frequency band, a second receiving terminal used to receive
a receiving frequency band of said second frequency band, and the
third internal terminal used to transmit and receive said first
frequency band; and a duplexer, connected to said third internal
terminal, of branching the transmitting frequency band and the
receiving frequency band of said first frequency band.
2. The 3-frequency branching circuit according to claim 1, wherein
said third internal terminal is connected to said branching means
and is also grounded via a diode.
3. The 3-frequency branching circuit according to claim 1, wherein
said third internal terminal is connected to said branching means
via the diode in a forward direction when transmitting and
receiving said first frequency band.
4. The 3-frequency branching circuit according to claim 1, further
comprising a low-pass filter inserted between said branching means
and said second switching circuit.
5. The 3-frequency branching circuit according to claim 1, wherein
said first receiving terminal and said third internal terminal are
connected to said antenna and are also grounded via the diode in a
forward direction and a grounding resistor respectively; and one
resistor is shared as the grounding resistor used for said
respective groundings.
6. The 3-frequency branching circuit according to claim 1, wherein
said first and second receiving terminals are connected to said
antenna and are also grounded via the diode in a forward direction
and a grounding resistor respectively; and one resistor is shred as
the grounding resistor used for said respective groundings.
7. A branching circuit having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of a first to Nth frequency bands, comprising: first and second
internal terminals; an antenna terminal of connecting to an
antenna; branching means having a first filter of passing n+1-th
(2.ltoreq.n.ltoreq.N-1) to Nth frequency bands between said first
internal terminal and said antenna terminal and a second filter of
passing the first to said nth frequency bands between said second
internal terminal and the antenna terminal; a first switching
circuit, connected to said first internal terminal, of switching
between the transmitting frequency bands and the receiving
frequency bands of said n+1-th to Nth frequency bands; a second
switching circuit, connected to said second internal terminal, of
switching between the transmitting frequency bands of said first
frequency band and said second to nth frequency bands and the
receiving frequency bands of said second to the nth frequency
bands; and a duplexer of branching the transmitting frequency band
and the receiving frequency band of said first frequency band.
8. A 3-frequency branching circuit having a filter function of
passing a transmitting frequency band and a receiving frequency
band in each of first, second and third frequency bands,
comprising: first, second, third and fourth internal terminals; an
antenna terminal of connecting to an antenna; branching means
having a first filter of passing said third frequency band between
said first internal terminal and said antenna terminal and a second
filter of passing said first and second frequency bands between
said second internal terminal and said antenna terminal; a first
switching circuit, connected to said first internal terminal, of
switching between the transmitting frequency band and the receiving
frequency band of said third frequency band; a second switching
circuit, connected to said second internal terminal, of switching
and transmitting the second frequency band to the third internal
terminal and the first frequency band to the fourth internal
terminal; a third switching circuit, connected to said third
internal terminal, of switching between the transmitting frequency
band and the receiving frequency band of said second transmitting
frequency band; and a duplexer, connected to said fourth internal
terminal, of branching the transmitting frequency band and the
receiving frequency band of said first frequency band.
9. The 3-frequency branching circuit according to claim 8, wherein
that said duplexer has a configuration in which a coaxial type
resonator is used and is comprised of a notch filter and a band
pass filter.
10. The 3-frequency branching circuit according to claim 9, wherein
said duplexer has the configuration in which a coaxial type
resonator is used, and a signal of a transmitting frequency band is
transmitted to said fourth internal terminal via said notch filter,
and a signal of a receiving frequency band is transmitted from said
fourth internal terminal via said band pass filter.
11. The 3-frequency branching circuit according to claim 8, wherein
said fourth internal terminal is an internal terminal of a
multilayered product.
12. The 3-frequency branching circuit according to claim 8, wherein
a SAW filter is used for said duplexer.
13. The 3-frequency branching circuit according to claim 8, wherein
said duplexer is comprised of a coaxial type resonator and a
layered filter.
14. The 3-frequency branching circuit according to claim 8, wherein
a coaxial type resonator and a SAW filter are used for said
duplexer.
15. The 3-frequency branching circuit according to claim 8, wherein
a layered filter and a SAW filter are used for said duplexer.
16. A branching circuit having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first to Nth frequency bands, comprising: first, second, third
and fourth internal terminals; an antenna terminal of connecting to
an antenna; branching means having a first filter of passing said
n+1-th (2.ltoreq.n.ltoreq.N-1) to Nth frequency bands between said
first internal terminal and said antenna terminal and a second
filter of passing said first to said nth frequency bands between
said second internal terminal and the antenna terminal; a first
switching circuit, connected to said first internal terminal, of
switching among the frequency bands of said n+1-th to Nth frequency
bands; a second switching circuit, connected to said second
internal terminal, of switching and transmitting the second to n-th
frequency bands to said third internal terminal and the first
frequency band to said fourth internal terminal; a third switching
circuit, connected to said third internal terminal, of switching
among said second to n-th frequency bands; and a duplexer,
connected to said fourth internal terminal, of branching the
transmitting frequency band and the receiving frequency band of
said first frequency band.
17. A 3-frequency branching circuit comprising: a duplexer having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first, second and third
frequency bands and equipped with first and second internal
terminals, an antenna terminal of connecting to an antenna, a first
filter of passing transmitting frequency bands of said three
frequency bands and receiving frequency bands of said second and
third frequency bands between said first internal terminal and said
antenna terminal, and a second filter of passing the receiving
frequency band of said first frequency band between said second
internal terminal and said antenna terminal; branching means,
connected to said first internal terminal, of branching (1) the
transmitting frequency band of said first frequency band,
transmitting frequency band of said second frequency band, and
receiving frequency band of said second frequency band, (2) the
transmitting frequency band of said third frequency band and the
receiving frequency band of said third frequency band; a first
switching circuit of switching between transmitting of said third
frequency band and receiving of said third frequency band; and a
second switching circuit of switching between transmitting of said
first and second frequency bands and receiving of said second
frequency band.
18. The 3-frequency branching circuit according to claim 17,
wherein said duplexer has a configuration using a coaxial type
resonator, said first filter is comprised of a notch filter and
said second filter is comprised of a band pass filter.
19. The 3-frequency branching circuit according to claim 17,
wherein said duplexer has a configuration using a coaxial type
resonator, and a notch filter and a low-pass filter are constituted
between said first internal terminal and said antenna terminal.
20. The 3-frequency branching circuit according to claim 17,
wherein said duplexer has a configuration using a coaxial type
resonator between said first internal terminal and said antenna
terminal, and said second filter is comprised of a layered
filter.
21. The 3-frequency branching circuit according to claim 17,
wherein said duplexer has a configuration using a coaxial type
resonator between said first internal terminal and said antenna
terminal, and a SAW filter is used for said second filter.
22. The 3-frequency branching circuit according to claim 17,
wherein said duplexer has a configuration using a layered filter
between said first internal terminal and said antenna terminal, and
a SAW filter is used between said second terminal and said antenna
terminal.
23. A 3-frequency branching circuit comprising: branching means,
having a filter function of passing a transmitting frequency band
and a receiving frequency band in each of first, second and third
frequency bands, of branching (1) the transmitting frequency band
and receiving frequency band of said third frequency band, (2) the
transmitting frequency band of said first and second frequency
bands and the receiving frequency band of said first and second
frequency bands, having first and second internal terminals, an
antenna terminal of connecting to an antenna, a first filter of
passing the transmitting frequency band and receiving frequency
band of the third frequency band between said first internal
terminal and said antenna terminal and a second filter of passing
the transmitting frequency band of said first and second frequency
bands and the receiving frequency band of said first and second
frequency bands between said second internal terminal and said
antenna terminal; a first switching circuit, connected to said
first internal terminal, of switching between transmitting of said
third frequency band and receiving of said third frequency band; a
duplexer, connected to said second internal terminal, having third
and fourth internal terminals, a third filter of passing the
transmitting frequency band of said first and second frequency
bands and the receiving frequency band of said second frequency
band between said third internal terminal and said second internal
terminal, and a fourth filter of passing the receiving frequency
band of said first frequency band between said fourth internal
terminal and said second internal terminal; and a second switching
circuit, connected to said third internal terminal, of switching
between the transmitting frequency band of said first and second
frequency bands and the receiving frequency band of said second
frequency band.
24. The 3-frequency branching circuit according to claim 23,
wherein said duplexer has a configuration using a coaxial type
resonator, and said third filter is comprised of a notch filter and
said fifth filter is comprised of a band pass filter.
25. The 3-frequency branching circuit according to claim 23,
wherein said duplexer has a configuration using a coaxial type
resonator, and said third filter is comprised of a notch filter and
a low-pass filter.
26. The 3-frequency branching circuit according to claim 23,
wherein said duplexer has a configuration using a layered filter,
where the layered filter constituted between said third internal
terminal and said second internal terminal is comprised of a notch
filter and the layered filter constituted between said fourth
internal terminal and said second internal terminal is comprised of
a band pass filter.
27. The 3-frequency branching circuit according to claim 23,
wherein said duplexer has a configuration using a layered filter,
where the layered filter constituted between said third internal
terminal and said second internal terminal is comprised of a notch
filter and a low-pass filter.
28. The 3-frequency branching circuit according to claim 23,
wherein said duplexer is comprised of a filter using a coaxial type
resonator between said third internal terminal and said second
internal terminal, and said fourth filter is comprised of a layered
filter.
29. The 3-frequency branching circuit according to claim 23,
wherein said duplexer is comprised of a filter using a coaxial type
resonator between said third internal terminal and said second
internal terminal, and the filter constituted between said fourth
internal terminal and said second internal terminal is comprised of
a SAW filter.
30. The 3-frequency branching circuit according to claim 23,
wherein said duplexer has said third filter comprised of a layered
filter and said fourth filter is comprised of a SAW filter.
31. A 3-frequency branching circuit comprising: a duplexer having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first, second and third
frequency bands and equipped with first, second and third internal
terminals, an antenna terminal of connecting to an antenna, a first
filter of passing a transmitting frequency band and a receiving
frequency band of said third frequency band between said first
internal terminal and said antenna terminal, a second filter of
passing the transmitting frequency band of said first and second
frequency bands and the receiving frequency band of said second
frequency band between said second internal terminal and said
antenna terminal, and a third filter of passing the receiving
frequency band of said first frequency band between said third
internal terminal and said antenna terminal; a first switching
circuit, connected to said first internal terminal, of switching
between the transmitting frequency band and the receiving frequency
band of said third frequency band; and a second switching circuit,
connected to said second internal terminal, of switching between
the transmitting frequency band of said first and second frequency
bands and the receiving frequency band of said second frequency
band.
32. The 3-frequency branching circuit according to claim 31,
wherein said first filter is formed by a low-pass filter, said
second filter is formed by a band pass filter, and said third
filter is formed by a high-pass filter.
33. The 3-frequency branching circuit according to claim 31,
wherein said first filter is formed by a low-pass filter, said
second filter is formed by a band pass filter, and said third
filter is formed by a notch filter.
34. A branching circuit having a first branching means having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first to Nth frequency bands,
and equipped with first to k-th internal terminals and an antenna
terminal of connecting to an antenna, wherein said first internal
terminal is a terminal of outputting the receiving frequency band
of said first frequency band; said k-th internal terminal is the
terminal of inputting the transmitting frequency band of said first
frequency band and inputting and outputting the transmitting
frequency bands and the receiving frequency bands of all or a part
of the second to said N-th frequency bands.
35. The branching circuit according to claim 34, further comprising
a second branching means, connected to said k-th internal terminal,
of branching the transmitting frequency band of said first
frequency band and all or a part of the frequency bands of said
second to said N-th frequency bands.
36. The branching circuit according to claim 35, wherein said N is
3 and said k is 2; said second internal terminal is the terminal of
inputting the transmitting frequency band of said first frequency
band and inputting and outputting the transmitting frequency bands
and the receiving frequency bands of said second and third
frequency bands which are all of said frequency bands; a first
switching circuit of switching between input of the transmitting
frequency band of said third frequency band and output of the
receiving frequency band of said third frequency band branched by
said second branching means; and a second switching circuit of
switching between the input of the transmitting frequency band of
said first frequency band and the transmitting frequency band of
said second frequency band and the output of the receiving
frequency band of said second frequency band branched by said
second branching means.
37. The branching circuit according to claim 34, wherein said N is
3 and said k is 2; said third internal terminal is a terminal of
inputting the transmitting frequency band of said first frequency
band and inputting and outputting the transmitting frequency band
and the receiving frequency band of said second frequency band
which is said part of frequency bands; said second internal
terminal is the terminal of inputting and outputting the
transmitting frequency band and the receiving frequency band of
said third frequency band which is the remaining frequency band; a
second switching circuit, connected to said third internal
terminal, of switching between the input of the transmitting
frequency band of said first frequency band and the transmitting
frequency band of said second frequency band and the output of the
receiving frequency band of said second frequency band; and a first
switching circuit, connected to said second internal terminal, of
switching between the input of the transmitting frequency band of
said third frequency band and the output of the receiving frequency
band of said third frequency band.
38. A branching circuit comprising: first branching means having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first to Nth frequency bands,
and equipped with first to k-th internal terminals and an antenna
terminal of connecting to an antenna, and wherein said first
internal terminal is a terminal of inputting the transmitting
frequency band of said first frequency band; said k-th internal
terminal is the terminal of outputting the receiving frequency band
of said first frequency band and inputting and outputting the
transmitting frequency bands and the receiving frequency bands of
all or a part of the second to N-th frequency bands.
39. A branching circuit comprising: first branching means having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first to Nth frequency bands,
and equipped with first and second internal terminals and an
antenna terminal of connecting to an antenna; and second branching
means having a filter function of passing the transmitting
frequency band and the receiving frequency band in each of first to
N-1-th frequency bands, and equipped with third to k-th internal
terminals and a connection terminal of connecting to. said second
internal terminal, wherein said first internal terminal is a
terminal of inputting and outputting the transmitting frequency
bands and the receiving frequency bands of said N-th frequency
bands; said second internal terminal is a terminal of inputting and
outputting the transmitting frequency band and the receiving
frequency band of said first to said N-1-th frequency bands; said
k-th internal terminal is the terminal of outputting the receiving
frequency band of said first frequency band; and said third
internal terminal is the terminal of inputting the transmitting
frequency band of said first frequency band and inputting and
outputting the transmitting frequency bands and the receiving
frequency bands of all or a part of said second to N-1-th frequency
bands.
40. The branching circuit according to claim 39, further comprising
third branching means, connected to said third internal terminal,
of branching the transmitting frequency band of said first
frequency band and all or a part of said second to N-th frequency
bands.
41. The branching circuit according to claim 39, wherein said N is
3 and said k is 4; said third internal terminal is the terminal of
inputting the transmitting frequency band of said first frequency
band and inputting and outputting the transmitting frequency band
and the receiving frequency band of said second frequency band
which is all of said frequency bands; a first switching circuit,
connected to said first internal terminal, of switching between the
input of the transmitting frequency band of said third frequency
band and the output of the receiving frequency band of said third
frequency band; and a second switching circuit, connected to said
third internal terminal, of switching between the input of the
transmitting frequency band of said first frequency band and the
transmitting frequency band of said second frequency band and the
output of the receiving frequency band of said second frequency
band.
42. A branching circuit comprising: first branching means having a
filter function of passing a transmitting frequency band and a
receiving frequency band in each of first to Nth frequency bands,
and equipped with first and second internal terminals and an
antenna terminal of connecting to an antenna; and second branching
means having a filter function of passing the transmitting
frequency band and the receiving frequency band in each of first to
N-1-th frequency bands, and equipped with third to k-th internal
terminals and a connection terminal of connecting to said second
internal terminal, wherein said first internal terminal is a
terminal of inputting and outputting the transmitting frequency
band and the receiving frequency band of said N-th frequency band;
said second internal terminal is the terminal of inputting and
outputting the transmitting frequency band and the receiving
frequency band of said first to said N-1-th frequency bands; said
k-th internal terminal is the terminal of inputting the
transmitting frequency band of said first frequency band; and said
third internal terminal is the terminal of outputting the receiving
frequency band of said first frequency band and inputting and
outputting all or a part of the transmitting frequency bands and
the receiving frequency bands of said second to N-1-th frequency
bands.
43. The 3-frequency branching circuit according to any one of
claims 1, 8, 17 and 23, wherein said branching means is constituted
by a layered configuration using the dielectric green sheet.
44. The 3-frequency branching circuit according to any one of
claims 1, 8, 17, 23 and 31, wherein at least one of said first,
second and third switching circuits, said duplexer and said first,
second and third filters is constituted by a layered configuration
using a dielectric green sheet.
45. The 3-frequency branching circuit according to any one of
claims 1, 8, 17, 23 and 31, wherein at least one of said branching
means, said first, second and third switching circuits, said
duplexer and said first, second and third filters is constituted by
mounting a switching element on a multilayered product using a
dielectric green sheet.
46. The 3-frequency branching circuit according to any one of
claims 1, 8, 17, 23 and 31, wherein at least one of said first,
second and third switching circuits has a configuration using a
diode.
47. The 3-frequency branching circuit according to any one of
claims 1, 8, 17, 23 and 31, wherein a GaAs (gallium arsenide)
switch is used for at least one of said branching means and said
first, second and third switching circuits.
48. The 3-frequency branching circuit according to any one of
claims 1, 8, 17, 23 and 31, wherein said first frequency band is a
frequency band supporting the W-CDMA method.
49. Radio communication equipment comprising: an antenna of
transmitting and receiving a signal; a 3-frequency branching
circuit according to any one of claims 1, 8, 17, 23 and 31 or a
branching circuit according to any one of claims 7, 16, 34, 38, 39
and 42; and signal processing means of processing the signal
branched by said 3-frequency branching circuit or branching
circuit.
Description
TECHNICAL FIELD
[0001] The present invention relates to a 3-frequency branching
circuit, a branching circuit and radio communication equipment
capable of switching a signal of a portable telephone for
instance.
BACKGROUND ART
[0002] In recent years, as for a 3-frequency branching circuit in
mobile communication equipment, attention is focused on a system of
selecting a transmitting and receiving frequency of three
frequencies in the systems of GSM, DCS and PCS with one portable
telephone or the like due to the expanding user base or
globalization of the systems, and moreover, attention is paid to
possibility of implementing a smaller size and a lower price as to
the mobile communication equipment such as the portable
telephone.
[0003] Hereafter, an example of the 3-frequency branching circuit
in the past will be described by referring to the drawings.
Moreover, FIG. 56 shows an equivalent circuit diagram of the
3-frequency branching circuit in the past.
[0004] In FIG. 56, a transmitting circuit side 2301 as one side has
an anode of a first diode P2301 connected thereto via a first
capacitor element C2301, and a contact A has a cathode connected
thereto.
[0005] Furthermore, the anode side of the first diode P2301 has a
control terminal 2302 connected thereto, and the control terminal
2302 plays a role of switching a transmitting and receiving signal
of one of the 3-frequency branching circuits.
[0006] In addition, a receiving circuit side 2303 as one side has
an anode of a second diode P2302 connected thereto via a second
capacitor element C2302, and a first strip line L2301 is connected
to one end of the anode side of the second diode P2302 having a
cathode connected to its ground side, and then the other end of the
first strip line L2301 is connected to the contact A.
[0007] Furthermore, a transmitting and receiving circuit 2304 as
one side connected to the contact A is connected to an antenna
terminal 2305 via a low-pass filter and a third capacitor element
C2303.
[0008] In addition, a transmitting circuit side 2306 as the other
side has an anode of a third diode P2303 connected thereto via a
fourth capacitor element C2304, and a cathode is connected to a
contact B. Furthermore, the anode side of the third diode P2303 has
a control terminal 2307 connected thereto, and the control terminal
2307 plays a role of switching the transmitting and receiving
signal of one of composite switches.
[0009] In addition, a contact C on the other receiving circuit side
has an anode of a fourth diode P2304 connected thereto via a fifth
capacitor element C2305, and a cathode is connected to its ground
side, and a second strip line L2302 is connected to one end of the
anode side of the fourth diode P2304, and then the other end of the
second strip line L2302 is connected to the contact B.
[0010] Furthermore, a transmitting and receiving circuit 2309 as
the other side connected to the contact B is connected to the
antenna terminal 2305 via a high-pass filter HPF and the third
capacitor element C2303.
[0011] Furthermore, a high-frequency receiving circuit side 2308
has an anode of a fifth diode P2305 connected thereto via a sixth
capacitor element C2306, and in addition, a control terminal 2311
is connected to the anode side of diode P2305 of the fifth diode,
and the control terminal 2311 plays a role of switching two
receiving signals of the 3-frequency branching circuit.
[0012] In addition, the other high-frequency receiving circuit side
2310 has an anode of a sixth diode P2306 connected thereto via a
seventh capacitor element C2307, and a cathode is connected to its
ground side, and a third strip line L2303 is connected to one end
of the anode side of the sixth diode P2306, and then the other end
of the third strip line L2303 is connected to the contact C.
[0013] Operation of the 3-frequency branching circuit constituted
as above will be described.
[0014] First, the cases of transmitting and receiving a low
frequency will be described.
[0015] In case of transmitting the low frequency, the first diode
P2301 and second diode P2302 will be in an on state by applying a
positive voltage to the control terminal 2302.
[0016] At this time, the capacitors C2301, 2302 and C2303 cut a DC
component, and so the current does not run to each terminal. In
addition, a transmitting signal transmitted from a transmitting
terminal 2301 is not transmitted to the receiving side because
impedance of the first strip line L2301 becomes an infinite size
due to the second diode P2302 connected to the ground side.
[0017] For that reason, the transmitting signal is transmitted to
the antenna terminal 2305 via the low-pass filter LPF.
[0018] Next, on receiving, the first diode P2301 and second diode
P2302 are in an off state in order to apply no voltage to the
control terminal 2302 so that the receiving signal is transmitted
from the antenna terminal 2305 to the receiving terminal 2303 via
the low-pass filter.
[0019] Next, the cases of transmitting and receiving a high
frequency will be described.
[0020] The third diode P2303 and fourth diode P2304 will be in the
on state by applying a positive voltage to a control terminal
2307.
[0021] At this time, the capacitors C2303, 2304 and C2305 cut a DC
component, and so the current does not run to each terminal. In
addition, the transmitting signal transmitted from a transmitting
terminal 2306 is not transmitted to the receiving side because the
impedance of the second strip line L2302 becomes the infinite size
due to the fourth diode P2304 connected to the ground side.
[0022] For that reason, the transmitting signal is transmitted to
the antenna terminal 2305 via the high-pass filter.
[0023] Moreover, on receiving, the third diode P2303 and fourth
diode P2304 are in the off state in order to apply no voltage to
the control terminal 2307 so that the receiving signal is
transmitted from the antenna terminal 2305 to the receiving side.
Thus, it can be transmitted to a receiving terminal side C via the
high-pass filter.
[0024] Next, in case of receiving on a receiving terminal 2308 as
one side, no voltage is applied to the control terminal 2307 on
receiving as mentioned above.
[0025] At this time, the fifth diode P2305 and sixth diode P2306
are put in the on state by applying the positive voltage to the
control terminal 2307, but the capacitors C2305, 2306 and C2307 cut
the DC component, and so the current does not run to each
terminal.
[0026] And the signal transmitted from the antenna terminal 2305 is
not transmitted to the other receiving terminal 2310 because the
impedance of the third strip line L2303 becomes the infinite size
due to the sixth diode P2306 connected to the ground side.
[0027] At this time, it is transmitted to the receiving terminal
2308 via the high-pass filter.
[0028] Next, when receiving on the other, the fifth diode P2305 and
sixth diode P2306 are in the off state in order to apply no voltage
to the control terminal 2307 so that the receiving signal is
transmitted from the antenna to the other receiving side.
[0029] For this reason, the other receiving signal can be
transferred from the antenna terminal 2305 to the receiving
terminal 2310 via the high-pass filter.
[0030] However, there was a problem that, although the above
configuration is suited to the TDMA (Time Division Multiple Access)
method such as GSM, DCS and PCS, it cannot be used for a system
wherein the TDMA method such as GSM and DCS and the W-CDMA
(Wide-band Code Division Multiple Access) method such as UMTS are
mixed.
DISCLOSURE OF THE INVENTION
[0031] An object of the present invention is, considering the above
problem in the past, to provide the 3-frequency branching circuit,
branching circuit and radio communication equipment also usable for
a system wherein the TDMA method and the W-CDMA method assuring
high tone quality and high speed data communication for instance
are mixed.
[0032] A 1st invention of the present invention (corresponding to
claim 1) is a 3-frequency branching circuit having a filter
function of passing a transmitting frequency band and a receiving
frequency band in each of first, second and third frequency bands,
comprising:
[0033] first, second and third internal terminals;
[0034] an antenna terminal of connecting to an antenna;
[0035] branching means having a first filter of passing the third
frequency band between said first internal terminal and said
antenna terminal and a second filter of passing said first and
second frequency bands between said second internal terminal and
said antenna terminal;
[0036] a first switching circuit, connected to said first internal
terminal, of switching between a first transmitting terminal used
to transmit said third frequency band and a first receiving
terminal used to receive said third frequency band;
[0037] a second switching circuit, connected to said second
internal terminal, of switching among a second transmitting
terminal used to transmit a transmitting frequency band of said
second frequency band, a second receiving terminal used to receive
a receiving frequency band of said second frequency band, and the
third internal terminal used to transmit and receive said first
frequency band; and
[0038] a duplexer, connected to said third internal terminal, of
branching the transmitting frequency band and the receiving
frequency band of said first frequency band.
[0039] A 2nd invention of the present invention (corresponding to
claim 2) is the 3-frequency branching circuit according to the 1st
invention, wherein said third internal terminal is connected to
said branching means and is also grounded via a diode.
[0040] A 3rd invention of the present invention (corresponding to
claim 3) is the 3-frequency branching circuit according to the 1st
invention, wherein said third internal terminal is connected to
said branching means via the diode in a forward direction when
transmitting and receiving said first frequency band.
[0041] A 4th invention of the present invention (corresponding to
claim 4) is the 3-frequency branching circuit according to the 1st
invention, further comprising a low-pass filter inserted between
said branching means and said second switching circuit.
[0042] A 5th invention of the present invention (corresponding to
claim 5) is the 3-frequency branching circuit according to the 1st
invention,
[0043] wherein said first receiving terminal and said third
internal terminal are connected to said antenna and are also
grounded via the diode in a forward direction and a grounding
resistor respectively; and
[0044] one resistor is shared as the grounding resistor used for
said respective groundings.
[0045] A 6th invention of the present invention (corresponding to
claim 6) is the 3-frequency branching circuit according to the 1st
invention,
[0046] wherein said first and second receiving terminals are
connected to said antenna and are also grounded via the diode in a
forward direction and a grounding resistor respectively; and
[0047] one resistor is shred as the grounding resistor used for
said respective groundings.
[0048] A 7th invention of the present invention (Corresponding to
claim 7) is a branching circuit having a filter function of passing
a transmitting frequency band and a receiving frequency band in
each of a first to Nth frequency bands, comprising:
[0049] first and second internal terminals;
[0050] an antenna terminal of connecting to an antenna;
[0051] branching means having a first filter of passing n+1-th
(2.ltoreq.n.ltoreq.N-1) to Nth frequency bands between said first
internal terminal and said antenna terminal and a second filter of
passing the first to said nth frequency bands between said second
internal terminal and the antenna terminal;
[0052] a first switching circuit, connected to said first internal
terminal, of switching between the transmitting frequency bands and
the receiving frequency bands of said n+1-th to Nth frequency
bands;
[0053] a second switching circuit, connected to said second
internal terminal, of switching between the transmitting frequency
bands of said first frequency band and said second to nth frequency
bands and the receiving frequency bands of said second to the nth
frequency bands; and
[0054] a duplexer of branching the transmitting frequency band and
the receiving frequency band of said first frequency band.
[0055] An 8th invention of the present invention (corresponding to
claim 8) is a 3-frequency branching circuit having a filter
function of passing a transmitting frequency band and a receiving
frequency band in each of first, second and third frequency bands,
comprising:
[0056] first, second, third and fourth internal terminals;
[0057] an antenna terminal of connecting to an antenna;
[0058] branching means having a first filter of passing said third
frequency band between said first internal terminal and said
antenna terminal and a second filter of passing said first and
second frequency bands between said second internal terminal and
said antenna terminal;
[0059] a first switching circuit, connected to said first internal
terminal, of switching between the transmitting frequency band and
the receiving frequency band of said third frequency band;
[0060] a second switching circuit, connected to said second
internal terminal, of switching and transmitting the second
frequency band to the third internal terminal and the first
frequency band to the fourth internal terminal;
[0061] a third switching circuit, connected to said third internal
terminal, of switching between the transmitting frequency band and
the receiving frequency band of said second transmitting frequency
band; and
[0062] a duplexer, connected to said fourth internal terminal, of
branching the transmitting frequency band and the receiving
frequency band of said first frequency band.
[0063] A 9th invention of the present invention (corresponding to
claim 9) is the 3-frequency branching circuit according to the 8th
invention,
[0064] wherein that said duplexer has a configuration in which a
coaxial type resonator is used and is comprised of a notch filter
and a band pass filter.
[0065] A 10th invention of the present invention (corresponding to
claim 10) is the 3-frequency branching circuit according to the 9th
invention,
[0066] wherein said duplexer has the configuration in which a
coaxial type resonator is used, and a signal of a transmitting
frequency band is transmitted to said fourth internal terminal via
said notch filter, and a signal of a receiving frequency band is
transmitted from said fourth internal terminal via said band pass
filter.
[0067] An 11th invention of the present invention (corresponding to
claim 11) is the 3-frequency branching circuit according to the 8th
invention,
[0068] wherein said fourth internal terminal is an internal
terminal of a multilayered product.
[0069] A 12th invention of the present invention (corresponding to
claim 12) is the 3-frequency branching circuit according to the 8th
invention,
[0070] wherein a SAW filter is used for said duplexer.
[0071] A 13th invention of the present invention (corresponding to
claim 13) is the 3-frequency branching circuit according to the 8th
invention,
[0072] wherein said duplexer is comprised of a coaxial type
resonator and a layered filter.
[0073] A 14th invention of the present invention (corresponding to
claim 14) is the 3-frequency branching circuit according to the 8th
invention,
[0074] wherein a coaxial type resonator and a SAW filter are used
for said duplexer.
[0075] A 15th invention of the present invention (corresponding to
claim 15) is the 3-frequency branching circuit according to the 8th
invention,
[0076] wherein a layered filter and a SAW filter are used for said
duplexer.
[0077] A 16th invention of the present invention (corresponding to
claim 16) is a branching circuit having a filter function of
passing a transmitting frequency band and a receiving frequency
band in each of first to Nth frequency bands, comprising:
[0078] first, second, third and fourth internal terminals;
[0079] an antenna terminal of connecting to an antenna;
[0080] branching means having a first filter of passing said n+1-th
(2.ltoreq.n.ltoreq.N-1) to Nth frequency bands between said first
internal terminal and said antenna terminal and a second filter of
passing said first to said nth frequency bands between said second
internal terminal and the antenna terminal;
[0081] a first switching circuit, connected to said first internal
terminal, of switching among the frequency bands of said n+1-th to
Nth frequency bands;
[0082] a second switching circuit, connected to said second
internal terminal, of switching and transmitting the second to n-th
frequency bands to said third internal terminal and the first
frequency band to said fourth internal terminal;
[0083] a third switching circuit, connected to said third internal
terminal, of switching among said second to n-th frequency bands;
and
[0084] a duplexer, connected to said fourth internal terminal, of
branching the transmitting frequency band and the receiving
frequency band of said first frequency band.
[0085] A 17th invention of the present invention (corresponding to
claim 17) is a 3-frequency branching circuit comprising:
[0086] a duplexer having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first, second and third frequency bands and equipped with first
and second internal terminals, an antenna terminal of connecting to
an antenna, a first filter of passing transmitting frequency bands
of said three frequency bands and receiving frequency bands of said
second and third frequency bands between said first internal
terminal and said antenna terminal, and a second filter of passing
the receiving frequency band of said first frequency band between
said second internal terminal and said antenna terminal;
[0087] branching means, connected to said first internal terminal,
of branching (1) the transmitting frequency band of said first
frequency band, transmitting frequency band of said second
frequency band, and receiving frequency band of said second
frequency band, (2) the transmitting frequency band of said third
frequency band and the receiving frequency band of said third
frequency band;
[0088] a first switching circuit of switching between transmitting
of said third frequency band and receiving of said third frequency
band; and
[0089] a second switching circuit of switching between transmitting
of said first and second frequency bands and receiving of said
second frequency band.
[0090] An 18th invention of the present invention (corresponding to
claim 18) is the 3-frequency branching circuit according to the
17th invention,
[0091] wherein said duplexer has a configuration using a coaxial
type resonator, said first filter is comprised of a notch filter
and said second filter is comprised of a band pass filter.
[0092] A 19th invention of the present invention (corresponding to
claim 19) is the 3-frequency branching circuit according to the
17th invention,
[0093] wherein said duplexer has a configuration using a coaxial
type resonator, and a notch filter and a low-pass filter are
constituted between said first internal terminal and said antenna
terminal.
[0094] A 20th invention of the present invention (corresponding to
claim 20) is the 3-frequency branching circuit according to the
17th invention,
[0095] wherein said duplexer has a configuration using a coaxial
type resonator between said first internal terminal and said
antenna terminal, and said second filter is comprised of a layered
filter.
[0096] A 21st invention of the present invention (corresponding to
claim 21) is the 3-frequency branching circuit according to the
17th invention, wherein said duplexer has a configuration using a
coaxial type resonator between said first internal terminal and
said antenna terminal, and a SAW filter is used for said second
filter.
[0097] A 22nd invention of the present invention (corresponding to
claim 22) is the 3-frequency branching circuit according to the
17th invention,
[0098] wherein said duplexer has a configuration using a layered
filter between said first internal terminal and said antenna
terminal, and a SAW filter is used between said second terminal and
said antenna terminal.
[0099] A 23rd invention of the present invention (corresponding to
claim 23) is a 3-frequency branching circuit comprising:
[0100] branching means, having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first, second and third frequency bands, of branching (1) the
transmitting frequency band and receiving frequency band of said
third frequency band, (2) the transmitting frequency band of said
first and second frequency bands and the receiving frequency band
of said first and second frequency bands, having first and second
internal terminals, an antenna terminal of connecting to an
antenna, a first filter of passing the transmitting frequency band
and receiving frequency band of the third frequency band between
said first internal terminal and said antenna terminal and a second
filter of passing the transmitting frequency band of said first and
second frequency bands and the receiving frequency band of said
first and second frequency bands between said second internal
terminal and said antenna terminal;
[0101] a first switching circuit, connected to said first internal
terminal, of switching between transmitting of said third frequency
band and receiving of said third frequency band;
[0102] a duplexer, connected to said second internal terminal,
having third and fourth internal terminals, a third filter of
passing the transmitting frequency band of said first and second
frequency bands and the receiving frequency band of said second
frequency band between said third internal terminal and said second
internal terminal, and a fourth filter of passing the receiving
frequency band of said first frequency band between said fourth
internal terminal and said second internal terminal; and
[0103] a second switching circuit, connected to said third internal
terminal, of switching between the transmitting frequency band of
said first and second frequency bands and the receiving frequency
band of said second frequency band.
[0104] A 24th invention of the present invention (corresponding to
claim 24) is the 3-frequency branching circuit according to the
23rd invention,
[0105] wherein said duplexer has a configuration using a coaxial
type resonator, and said third filter is comprised of a notch
filter and said fifth filter is comprised of a band pass
filter.
[0106] A 25th invention of the present invention (corresponding to
claim 25) is the 3-frequency branching circuit according to the
23rd invention,
[0107] wherein said duplexer has a configuration using a coaxial
type resonator, and said third filter is comprised of a notch
filter and a low-pass filter.
[0108] A 26th invention of the present invention (corresponding to
claim 26) is the 3-frequency branching circuit according to the
23rd invention,
[0109] wherein said duplexer has a configuration using a layered
filter, where the layered filter constituted between said third
internal terminal and said second internal terminal is comprised of
a notch filter and the layered filter constituted between said
fourth internal terminal and said second internal terminal is
comprised of a band pass filter.
[0110] A 27th invention of the present invention (corresponding to
claim 27) is the 3-frequency branching circuit according to the
23rd invention,
[0111] wherein said duplexer has a configuration using a layered
filter, where the layered filter constituted between said third
internal terminal and said second internal terminal is comprised of
a notch filter and a low-pass filter.
[0112] A 28th invention of the present invention (corresponding to
claim 28) is the 3-frequency branching circuit according to the
23rd invention,
[0113] wherein said duplexer is comprised of a filter using a
coaxial type resonator between said third internal terminal and
said second internal terminal, and said fourth filter is comprised
of a layered filter.
[0114] A 29th invention of the present invention (corresponding to
claim 29) is the 3-frequency branching circuit according to the
23rd invention,
[0115] wherein said duplexer is comprised of a filter using a
coaxial type resonator between said third internal terminal and
said second internal terminal, and the filter constituted between
said fourth internal terminal and said second internal terminal is
comprised of a SAW filter.
[0116] A 30th invention of the present invention (corresponding to
claim 30) is the 3-frequency branching circuit according to the
23rd invention,
[0117] wherein said duplexer has said third filter comprised of a
layered filter and said fourth filter is comprised of a SAW
filter.
[0118] A 31st invention of the present invention (corresponding to
claim 31) is a 3-frequency branching circuit comprising:
[0119] a duplexer having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first, second and third frequency bands and equipped with first,
second and third internal terminals, an antenna terminal of
connecting to an antenna, a first filter of passing a transmitting
frequency band and a receiving frequency band of said third
frequency band between said first internal terminal and said
antenna terminal, a second filter of passing the transmitting
frequency band of said first and second frequency bands and the
receiving frequency band of said second frequency band between said
second internal terminal and said antenna terminal, and a third
filter of passing the receiving frequency band of said first
frequency band between said third internal terminal and said
antenna terminal;
[0120] a first switching circuit, connected to said first internal
terminal, of switching between the transmitting frequency band and
the receiving frequency band of said third frequency band; and
[0121] a second switching circuit, connected to said second
internal terminal, of switching between the transmitting frequency
band of said first and second frequency bands and the receiving
frequency band of said second frequency band.
[0122] A 32nd invention of the present invention (corresponding to
claim 32) is the 3-frequency branching circuit according to the
31st invention,
[0123] wherein said first filter is formed by a low-pass filter,
said second filter is formed by a band pass filter, and said third
filter is formed by a high-pass filter.
[0124] A 33rd invention of the present invention (corresponding to
claim 33) is the 3-frequency branching circuit according to the
31st invention,
[0125] wherein said first filter is formed by a low-pass filter,
said second filter is formed by a band pass filter, and said third
filter is formed by a notch filter.
[0126] A 34th invention of the present invention (corresponding to
claim 34) is a branching circuit having a first branching means
having a filter function of passing a transmitting frequency band
and a receiving frequency band in each of first to Nth frequency
bands, and equipped with first to k-th internal terminals and an
antenna terminal of connecting to an antenna,
[0127] wherein said first internal terminal is a terminal of
outputting the receiving frequency band of said first frequency
band;
[0128] said k-th internal terminal is the terminal of inputting the
transmitting frequency band of said first frequency band and
inputting and outputting the transmitting frequency bands and the
receiving frequency bands of all or a part of the second to said
N-th frequency bands.
[0129] A 35th invention of the present invention (corresponding to
claim 35) is the branching circuit according to the 34th invention,
further comprising a second branching means, connected to said k-th
internal terminal, of branching the transmitting frequency band of
said first frequency band and all or a part of the frequency bands
of said second to said N-th frequency bands.
[0130] A 36th invention of the present invention (corresponding to
claim 36) is the branching circuit according to the 35th
invention,
[0131] wherein said N is 3 and said k is 2;
[0132] said second internal terminal is the terminal of inputting
the transmitting frequency band of said first frequency band and
inputting and outputting the transmitting frequency bands and the
receiving frequency bands of said second and third frequency bands
which are all of said frequency bands;
[0133] a first switching circuit of switching between input of the
transmitting frequency band of said third frequency band and output
of the receiving frequency band of said third frequency band
branched by said second branching means; and
[0134] a second switching circuit of switching between the input of
the transmitting frequency band of said first frequency band and
the transmitting frequency band of said second frequency band and
the output of the receiving frequency band of said second frequency
band branched by said second branching means.
[0135] A 37th invention of the present invention (corresponding to
claim 37) is the branching circuit according to the 34th
invention,
[0136] wherein said N is 3 and said k is 2;
[0137] said third internal terminal is a terminal of inputting the
transmitting frequency band of said first frequency band and
inputting and outputting the transmitting frequency band and the
receiving frequency band of said second frequency band which is
said part of frequency bands;
[0138] said second internal terminal is the terminal of inputting
and outputting the transmitting frequency band. and the receiving
frequency band of said third frequency band which is the remaining
frequency band;
[0139] a second switching circuit, connected to said third internal
terminal, of switching between the input of the transmitting
frequency band of said first frequency band and the transmitting
frequency band of said second frequency band and the output of the
receiving frequency band of said second frequency band; and
[0140] a first switching circuit, connected to said second internal
terminal, of switching between the input of the transmitting
frequency band of said third frequency band and the output of the
receiving frequency band of said third frequency band.
[0141] A 38th invention of the present invention (corresponding to
claim 38) is a branching circuit comprising:
[0142] first branching means having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first to Nth frequency bands, and equipped with first to k-th
internal terminals and an antenna terminal of connecting to an
antenna, and
[0143] wherein said first internal terminal is a terminal of
inputting the transmitting frequency band of said first frequency
band;
[0144] said k-th internal terminal is the terminal of outputting
the receiving frequency band of said first frequency band and
inputting and outputting the transmitting frequency bands and the
receiving frequency bands of all or a part of the second to N-th
frequency bands.
[0145] A 39th invention of the present invention (corresponding to
claim 39) is a branching circuit comprising:
[0146] first branching means having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first to Nth frequency bands, and equipped with first and second
internal terminals and an antenna terminal of connecting to an
antenna; and
[0147] second branching means having a filter function of passing
the transmitting frequency band and the receiving frequency band in
each of first to N-1-th frequency bands, and equipped with third to
k-th internal terminals and a connection terminal of connecting to
said second internal terminal,
[0148] wherein said first internal terminal is a terminal of
inputting and outputting the transmitting frequency bands and the
receiving frequency bands of said N-th frequency bands;
[0149] said second internal terminal is a terminal of inputting and
outputting the transmitting frequency band and the receiving
frequency band of said first to said N-1-th frequency bands;
[0150] said k-th internal terminal is the terminal of outputting
the receiving frequency band of said first frequency band; and
[0151] said third internal terminal is the terminal of inputting
the transmitting frequency band of said first frequency band and
inputting and outputting the transmitting frequency bands and the
receiving frequency bands of all or a part of said second to N-1-th
frequency bands.
[0152] A 40th invention of the present invention (corresponding to
claim 40) is the branching circuit according to the 39th invention,
further comprising third branching means, connected to said third
internal terminal, of branching the transmitting frequency band of
said first frequency band and all or a part of said second to N-th
frequency bands.
[0153] A 41st invention of the present invention (corresponding to
claim 41) is the branching circuit according to the 39th
invention,
[0154] wherein said N is 3 and said k is 4;
[0155] said third internal terminal is the terminal of inputting
the transmitting frequency band of said first frequency band and
inputting and outputting the transmitting frequency band and the
receiving frequency band of said second frequency band which is all
of said frequency bands;
[0156] a first switching circuit, connected to said first internal
terminal, of switching between the input of the transmitting
frequency band of said third frequency band and the output of the
receiving frequency band of said third frequency band; and
[0157] a second switching circuit, connected to said third internal
terminal, of switching between the input of the transmitting
frequency band of said first frequency band and the transmitting
frequency band of said second frequency band and the output of the
receiving frequency band of said second frequency band.
[0158] A 42nd invention of the present invention (corresponding to
claim 42) is a branching circuit comprising:
[0159] first branching means having a filter function of passing a
transmitting frequency band and a receiving frequency band in each
of first to Nth frequency bands, and equipped with first and second
internal terminals and an antenna terminal of connecting to an
antenna; and
[0160] second branching means having a filter function of passing
the transmitting frequency band and the receiving frequency band in
each of first to N-1-th frequency bands, and equipped with third to
k-th internal terminals and a connection terminal of connecting to
said second internal terminal,
[0161] wherein said first internal terminal is a terminal of
inputting and outputting the transmitting frequency band and the
receiving frequency band of said N-th frequency band;
[0162] said second internal terminal is the terminal of inputting
and outputting the transmitting frequency band and the receiving
frequency band of said first to said N-1-th frequency bands;
[0163] said k-th internal terminal is the terminal of inputting the
transmitting frequency band of said first frequency band; and
[0164] said third internal terminal is the terminal of outputting
the receiving frequency band of said first frequency band and
inputting and outputting all or a part of the transmitting
frequency bands and the receiving frequency bands of said second to
N-1-th frequency bands.
[0165] A 43rd invention of the present invention (corresponding to
claim 43) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th and 23rd inventions,
[0166] wherein said branching means is constituted by a layered
configuration using the dielectric green sheet.
[0167] A 44th invention of the present invention (corresponding to
claim 44) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th , 23rd and 31st inventions,
[0168] wherein at least one of said first, second and third
switching circuits, said duplexer and said first, second and third
filters is constituted by a layered configuration using a
dielectric green sheet.
[0169] A 45th invention of the present invention (corresponding to
claim 45) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th , 23rd and 31st inventions,
[0170] wherein at least one of said branching means, said first,
second and third switching circuits, said duplexer and said first,
second and third filters is constituted by mounting a switching
element on a multilayered product using a dielectric green
sheet.
[0171] A 46th invention of the present invention (corresponding to
claim 46) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th , 23rd and 31st inventions,
[0172] wherein at least one of said first, second and third
switching circuits has a configuration using a diode.
[0173] A 47th invention of the present invention (corresponding to
claim 47) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th , 23rd and 31st inventions,
[0174] wherein a GaAs (gallium arsenide) switch is used for at
least one of said branching means and said first, second and third
switching circuits.
[0175] A 48th invention of the present invention (corresponding to
claim 48) is the 3-frequency branching circuit according to any one
of the 1st , 8th , 17th , 23rd and 31st inventions,
[0176] wherein said first frequency band is a frequency band
supporting the W-CDMA method.
[0177] A 49th invention of the present invention (corresponding to
claim 49) is radio communication equipment comprising:
[0178] an antenna of transmitting and receiving a signal;
[0179] a 3-frequency branching circuit according to any one of the
1st , 8th , 17th , 23rd and 31st inventions or a branching circuit
according to any one of the 7th , 16th , 34th , 38th , 39th and
42nd inventions; and
[0180] signal processing means of processing the signal branched by
said 3-frequency branching circuit or branching circuit.
[0181] Thus, the 3-frequency branching circuit according to the
present invention has a first internal terminal of a transmitting
frequency band of three frequencies and a receiving frequency band
of two frequencies, a second internal terminal of the receiving
frequency band of one remaining frequency, and a third antenna
terminal of connecting to the antenna, for instance, where the
above described filter makes a duplexer of branching a frequency
band wherein a band width of which common terminal is the third
antenna terminal is a broad band and the respective frequency bands
are in proximity, the above described first internal terminal has a
branching filter of branching low and high frequency bands, a
switching circuit of switching transmitting and receiving is
provided to the other end of the low frequency band, and the
switching circuit of switching transmitting and receiving is also
provided to the other end of the high frequency band.
BRIEF DESCRIPTION OF THE DRAWINGS
[0182] FIG. 1 is a block diagram of a 3-frequency branching circuit
according to a first embodiment of the present invention;
[0183] FIG. 2 is an explanatory view of frequency bands
corresponding to GSM, DCS and W-CDMA;
[0184] FIG. 3 are an explanatory view (FIG. 3 (a) ) of the
3-frequency branching circuit (front) and an explanatory view (FIG.
3 (b)) of the 3-frequency branching circuit (backside) according to
the first embodiment of the present invention;
[0185] FIG. 4 is a circuit diagram of the 3-frequency branching
circuit according to the first embodiment of the present
invention;
[0186] FIG. 5 is an equivalent circuit diagram of a duplexer 4
according to the first embodiment of the present invention;
[0187] FIG. 6 is a circuit diagram of the 3-frequency branching
circuit wherein an internal terminal 23 is connected to branching
means 3 via a diode D1 according to the present invention;
[0188] FIG. 7 is an explanatory view of the 3-frequency branching
circuit having a low-pass filter 11 inserted between the branching
means 3 and a switching circuit 2 according to the present
invention;
[0189] FIG. 8 is an explanatory view of the 3-frequency branching
circuit having grounding resistor R shared between the switching
circuits 1 and 2 according to the present invention;
[0190] FIG. 9 are an explanatory view (FIG. 9 (a)) of the
3-frequency branching circuit (front) equipped with a SAW filter
and an explanatory view (FIG. 9 (b)) of the same 3-frequency
branching circuit (backside) according to the present
invention;
[0191] FIG. 10 are an explanatory view (FIG. 10 (a)) of the
3-frequency branching circuit (front) equipped with a duplexer on a
multilayered product and an explanatory view (FIG. 10 (b)) of the
same 3-frequency branching circuit (backside) according to the
present invention;
[0192] FIG. 11 are an explanatory view (FIG. 11 (a)) of the
3-frequency branching circuit (front) equipped with a duplexer
inside a multilayered product and an explanatory view (FIG. 11 (b))
of the same 3-frequency branching circuit (backside) according to
the present invention;
[0193] FIG. 12 is a circuit diagram of the 3-frequency branching
circuit according to a second embodiment of the present
invention;
[0194] FIG. 13 is a perspective view of a layered type duplexer
according to a third embodiment of the present invention;
[0195] FIG. 14 is an exploded perspective view of the layered type
duplexer according to the third embodiment of the present
invention;
[0196] FIG. 15 is an equivalent circuit diagram of the layered type
duplexer according to the third embodiment of the present
invention;
[0197] FIG. 16 is a top view of the duplexer combining a coaxial
type and the layered type described in the third embodiment of the
present invention;
[0198] FIG. 17 is a top view of the duplexer combining the coaxial
type and a SAW filter described in the third embodiment of the
present invention;
[0199] FIG. 18 is a top view of the duplexer combining the layered
type and SAW filter described in the third embodiment of the
present invention;
[0200] FIG. 19 is an equivalent circuit diagram of the 3-frequency
branching circuit according to a fourth embodiment of the present
invention;
[0201] FIG. 20 is a diagram showing an example of a characteristic
of a branching filter according to the fourth embodiment of the
present invention;
[0202] FIG. 21 is an equivalent circuit diagram of another form of
the 3-frequency branching circuit according to the fourth
embodiment of the present invention;
[0203] FIG. 22 is an equivalent circuit diagram of another form of
the 3-frequency branching circuit according to the fourth
embodiment of the present invention;
[0204] FIG. 23 is a perspective view of the 3-frequency branching
circuit according to a fifth embodiment of the present
invention;
[0205] FIG. 24 is a perspective view of another form of the
3-frequency branching circuit according to the fifth embodiment of
the present invention;
[0206] FIG. 25 is a circuit diagram of the 3-frequency branching
circuit according to a sixth embodiment of the present
invention;
[0207] FIG. 26 is an equivalent circuit diagram of the coaxial type
duplexer according to a seventh embodiment of the present
invention;
[0208] FIG. 27 is a top view of the coaxial type duplexer according
to the seventh embodiment of the present invention;
[0209] FIG. 28 is a characteristic view of the duplexer according
to the seventh embodiment of the present invention;
[0210] FIG. 29 is a perspective view of the layered type duplexer
according to an eighth embodiment of the present invention;
[0211] FIG. 30 is an exploded perspective view of the layered type
duplexer according to the eighth embodiment of the present
invention;
[0212] FIG. 31 is an equivalent circuit diagram of the layered type
duplexer according to the eighth embodiment of the present
invention;
[0213] FIG. 32 is a top view of the duplexer combining the coaxial
type and the layered type described in the eighth embodiment of the
present invention;
[0214] FIG. 33 is a top view of the duplexer combining the coaxial
type and the SAW filter described in the eighth embodiment of the
present invention;
[0215] FIG. 34 is a top view of the-duplexer combining the layered
type and the SAW filter described in the eighth embodiment of the
present invention;
[0216] FIG. 35 is an equivalent circuit diagram of the 3-frequency
branching circuit according to a ninth embodiment of the present
invention;
[0217] FIG. 36 is a characteristic view of the duplexer according
to the ninth embodiment of the present invention;
[0218] FIG. 37 is a perspective view of the multilayered product of
the branching filter according to a tenth embodiment of the present
invention;
[0219] FIG. 38 is an exploded perspective view of the means (lower
half) including a first switching circuit and a second switching
circuit according to the tenth embodiment of the present
invention;
[0220] FIG. 39 is an exploded perspective view of the means (upper
half) including the first switching circuit and second switching
circuit according to the tenth embodiment of the present
invention;
[0221] FIG. 40 is a perspective view of the means integrating the
layered type duplexer of the 3-frequency branching circuit as in
the eighth embodiment of the present invention and the multilayered
product constituting the first and second switching circuits as in
the tenth embodiment;
[0222] FIG. 41 is a perspective view of the means integrating a
combination of a notch filter and a band pass filter as in the
eighth embodiment of the present invention and the multilayered
product constituting the branching filter and first and second
switching circuits as in the tenth embodiment;
[0223] FIG. 42 is a perspective view of the multilayered product
integrating a 1 input-4 output or 1 input-5 output GaAs (gallium
arsenide) switch and the layered type duplexer as in the eighth
embodiment of the present invention;
[0224] FIG. 43 is a perspective view of the multilayered product
integrating the input-4 output or 1 input-5 output GaAs (gallium
arsenide) switch and a combination of the notch filter and band
pass filter as in the eighth embodiment of the present
invention;
[0225] FIG. 44 is a circuit diagram of the 3-frequency branching
circuit according to a fifteenth embodiment of the present
invention;
[0226] FIG. 45 is an equivalent circuit diagram of the 3-frequency
branching circuit according to a sixteenth embodiment of the
present invention;
[0227] FIG. 46 is a perspective view of the multilayered product of
the branching filter according to a seventeenth embodiment of the
present invention;
[0228] FIG. 47 is an exploded perspective view of the means (lower
half) including the first switching circuit and second switching
circuit according to the seventeenth embodiment of the present
invention;
[0229] FIG. 48 is an exploded perspective view of the means (upper
half) including the first switching circuit and second switching
circuit according to the seventeenth embodiment of the present
invention;
[0230] FIG. 49 is a circuit diagram of the 3-frequency branching
circuit according to an eighteenth embodiment of the present
invention;
[0231] FIG. 50 is an equivalent circuit diagram of the coaxial type
duplexer according to a nineteenth embodiment of the present
invention;
[0232] FIG. 51 is a top view of the coaxial type duplexer according
to the nineteenth embodiment of the present invention;
[0233] FIG. 52 is a characteristic view of the duplexer according
to the nineteenth embodiment of the present invention;
[0234] FIG. 53 is a perspective view of the layered type duplexer
according to a twentieth embodiment of the present invention;
[0235] FIG. 54 is an exploded perspective view of the layered type
duplexer according to the twentieth embodiment of the present
invention;
[0236] FIG. 55 is an equivalent circuit diagram of the layered type
duplexer according to the twentieth embodiment of the present
invention; and
[0237] FIG. 56 is a circuit diagram of the 3-frequency branching
circuit in the past.
DESCRIPTION OF THE SYMBOLS
[0238] 1, 2 Switching circuits (transmitting and receiving
switching circuits)
[0239] 3 Branching means (branching circuit)
[0240] 4 Duplexer
[0241] 20 Antenna terminal
[0242] 21 to 23 Internal terminals
[0243] 11 to 13 Low-pass filters (LPF)
BEST MODE FOR CARRYING OUT THE INVENTION
[0244] Hereafter, embodiments of the present invention will be
described by referring to the drawings.
[0245] (First Embodiment)
[0246] First, the configuration and operation of a 3-frequency
branching circuit of this embodiment will be described mainly by
referring to FIG. 1. Moreover, FIG. 1 is a block diagram of the
3-frequency branching circuit according to this embodiment.
[0247] The 3-frequency branching circuit according to this
embodiment is a triple-switch 3-frequency branching circuit having
a filter function of passing a transmitting frequency band and a
receiving frequency band in each of GSM (a third frequency band),
DCS (a second frequency band) and W-CDMA (a first frequency band)
as shown in FIG. 2, and has switching circuits (transmitting and
receiving switching circuits) 1 and 2, a branching means (branching
circuit) 3 and a duplexer 4 and also has an appearance as shown in
FIGS. 3 (a) to (b) Moreover, FIG. 2 is an explanatory view of
frequency bands corresponding to GSM, DCS and W-CDMA. In addition,
FIG. 3 (a) is an explanatory view of the 3-frequency branching
circuit (front) according to this embodiment (explanatory view of
an example integrating the switching circuits and branching
circuit) and FIG. 3 (b) is an explanatory view of the 3-frequency
branching circuit (backside) according to this embodiment.
[0248] Next, each means of the 3-frequency branching circuit of
this embodiment will be described in further detail.
[0249] The branching means 3 is the means having internal terminal
21 and 22, an antenna terminal 20 of connecting to an antenna (ANT)
, a low-pass filter (LPF) of passing the third frequency band (GSM)
connected between the internal terminal 21 and the antenna terminal
20, and a high-pass filter (HPF) of passing the first and second
frequency bands (DCS and W-CDMA) connected between the internal
terminal 22 and the antenna terminal 20.
[0250] The switching circuit 1 is the means connected to the
internal terminal 21 for the purpose of switching between a
transmitting terminal T x 1 (GSM TX) utilized for transmission of
the third frequency band (GSM) and a receiving terminal R x 1 (GSM
RX) utilized for receiving of the third frequency band.
[0251] The switching circuit 2 is the means connected to the
internal terminal 22 for the purpose of switching among the
internal terminal 23 utilized for transmitting and receiving of the
first frequency band (W-CDMA), a transmitting terminal T x 2 (DCS
TX) utilized for transmission of a transmitting frequency band of
the second frequency band (DCS) and a receiving terminal R x 2
(DCSRX) utilized for receiving of a receiving frequency band of the
second frequency band (DCS).
[0252] The duplexer 4 is the means connected to the third internal
terminal 23 for the purpose of switching between transmitting and
receiving of the first frequency band (W-CDMA) (to be more
specific, switching between a transmitting terminal T x 3 (W-CDMA
TX) utilized for transmission of a transmitting frequency band of
the first frequency band (W-CDMA) and a receiving terminal R x 3
(W-CDMA RX) utilized for receiving of a receiving frequency band of
the first frequency band (W-CDMA)).
[0253] Next, a circuit configuration of the 3-frequency branching
circuit of this embodiment will be described by referring to FIG.
4. Moreover, FIG. 4 is a circuit diagram of the 3-frequency
branching circuit according to this embodiment.
[0254] The transmitting terminal T x 1 is connected to the antenna
side via a diode D2 which is in a forward direction when
transmitting. In addition, the receiving terminal R x 1 is
connected to the antenna side, and is also grounded Via a diode D4
which is in the forward direction. Moreover, a control terminal VC1
is connected to a voltage control portion (omitted in the drawings)
via a resistor R1. In addition, a low-pass filter 12 is inserted
between the transmitting terminal T x 1 and the anode of diode D2
as a filter of reducing noise (signal distortion) due to
amplification when transmitting by utilizing the transmitting
terminal T x 1.
[0255] The transmitting terminal T x 2 is connected to the antenna
side via a diode D3 which is in the forward direction when
transmitting. In addition, the receiving terminal R x 2 is
connected to the antenna side via a diode D1 which is in the
opposite direction (off state) when transmitting by utilizing the
transmitting terminal T x 2 (the diode D1 is in the forward
direction when receiving by utilizing the receiving terminal R x
2). Moreover, a control terminal VC2 is connected to the voltage
control portion (omitted in the drawings) via a resistor R2, and a
control terminal VC3 is connected to the voltage control portion
(omitted in the drawings) via a resistor R3. In addition, a
low-pass filter 13 is inserted between the transmitting terminal T
x 2 and the anode of diode D3 as a filter of reducing the noise due
to the amplification when transmitting by utilizing the
transmitting terminal T x 2.
[0256] The internal terminal 23 (refer to FIG. 1) is connected to
the duplexer 4, and is also grounded high-frequency-wise via a
diode D5 in the forward direction.
[0257] Here, circuit configuration of the duplexer 4 will be
described in detail by referring to FIG. 5. Moreover, FIG. 5 is an
equivalent circuit diagram of the duplexer 4 (the duplexer 4 is the
substantially same as the duplexer (refer to FIG. 15) in a third
embodiment described later).
[0258] The duplexer 4 is comprised of a large number of dielectric
layers consisting of layers A to H (omitted in the drawings) The
layer A has a first ground electrode formed therein. In addition,
the layer B has first to fifth resonator electrodes 5302 to 5306
formed therein, and the layer C has first to second capacitor
coupling electrodes 5307 to 5308 formed therein. The layer D has
third to sixth capacitor coupling electrodes 5309 to 5312 and first
to second strip line electrodes 5313 to 5314 formed therein. The
layers E to G have seventh to ninth capacitor coupling electrodes
5315 to 5317 formed therein. Furthermore, the layer H has a second
ground electrode 318 formed therein.
[0259] An electrode to be the transmitting terminal T x 3 of W-CDMA
(refer to FIGS. 1 and 4) is connected to the strip line electrode
5314, and is grounded by the ground electrode via the capacitor
coupling electrode 5317. The other end of the strip line electrode
5314 is connected to one end of the capacitor coupling electrode
5312, and the capacitor coupling electrode 5312 is connected to the
resonator electrode 5302 via the layers C to D. The other end of
the capacitor coupling electrode 5312 is connected to one end of
the capacitor coupling electrode 5311, and the capacitor coupling
electrode 5311 is connected to the resonator electrode 5303 via the
layers C to D. The other end of the capacitor coupling electrode
5311 is connected to one end of the strip line electrode 5313, and
one end of the strip line electrode 5313 is connected to one end of
the capacitor coupling electrode 5316 via the layers E to F. The
other end of the capacitor coupling electrode 5316 is grounded by
an external electrode. And the other end of the strip line
electrode 5313 is connected to an internal terminal 23 (refer to
FIG. 1) on the antenna terminal side so as to form a notch filter
structure.
[0260] An electrode to be the receiving terminal R x 3 of W-CDMA
(refer to FIGS. 1 and 4) is connected to one end of the capacitor
electrode 5315. The capacitor electrode 5315 is connected to the
resonator electrode 5304 via the layers C to E, and the resonator
electrode 5304 is connected to the capacitor electrode 5307 via the
layer C, and the capacitor electrode 5307 is connected to the
resonator electrode 5305 via the layer C. In addition, the
resonator electrode 5305 is connected to the capacitor electrode
5308 via the layer C, and the capacitor electrode 5308 is connected
to the resonator electrode 5306 via the layer C, and capacitor
electrode 5307 is connected to the capacitor electrode 5308 via the
layer D. The resonator electrode 5306 is connected to the capacitor
electrode 5310 via the layers C and D. And the capacitor electrode
5310 is connected to the internal terminal 23 (refer to FIG. 1) on
the antenna terminal side so as to form a band-pass filter
structure.
[0261] Moreover, the transmitting terminal T x 1 (GSM TX) is
corresponding to a first transmitting terminal of the present
invention, the receiving terminal R x 1 (GSM RX) is corresponding
to a first receiving terminal of the present invention, and the
switching circuit (transmitting and receiving switching circuit) 1
is corresponding to a first switching circuit of the present
invention. In addition, the transmitting terminal T x 2 (DCS TX) is
corresponding to a second transmitting terminal of the present
invention and the receiving terminal R x 2 (DCS RX) is
corresponding to a second receiving terminal of the present
invention respectively, and the internal terminal 23 is
corresponding to a third internal terminal of the present
invention, and the switching circuit (transmitting and receiving
switching circuit) 2 is corresponding to a second switching circuit
of the present invention. Moreover, the internal terminal 21 to 22
are corresponding to the first and second internal terminals of the
present invention respectively, the antenna terminal 20 is
corresponding to the antenna terminal of the present invention, and
the branching means (branching circuit) 3 is corresponding to the
branching means of the present invention. In addition, the
transmitting terminal T x 3 (W-CDMA TX) is corresponding to a third
transmitting terminal of the present invention, the receiving
terminal R x 3 (W-CDMA RX) is corresponding to a third receiving
terminal of the present invention, and the duplexer 4 is
corresponding to the duplexer of the present invention.
[0262] Thus, it is possible to support a system having the TDMA
method and the W-CDMA method mixed therein by rendering an antenna
switch on the high-frequency band (2 GHz band) side as the
switching circuit 2 of 1 input and 3 outputs (SP3T) and connecting
the duplexer 4 thereto. Moreover, the internal terminal 23 (refer
to FIG. 1) to have the duplexer 4 connected thereto is the terminal
grounded via a diode D5 (refer to FIG. 4), and so no diode exists
on a signal route for transmitting and receiving of W-CDMA and a
low-loss characteristic may be obtained.
[0263] The embodiment 1 was described in detail as above.
[0264] Moreover, while the first frequency band of the present
invention was the one corresponding to the W-CDMA method in the
above-mentioned embodiment, it is not limited thereto but may be
any frequency band, in short, as far as it is the one of performing
simultaneous transmitting and receiving by utilizing the duplexer
(for instance, it is possible to support the CDMA method of 800 MHz
by connecting the switching circuits 1 and 2 to the internal
terminal 22 and 21 respectively and using the duplexer 4 (refer to
FIG. 1)).
[0265] In addition, the third internal terminal of the present
invention was the terminal grounded via the diode D5 (refer to FIG.
4) as well as connected to the branching means 3 in this embodiment
described above. However, not limiting thereto, but the third
internal terminal of the present invention may be the terminal
connected to the branching means via the diode to be in the forward
direction on transmitting and receiving of the first frequency band
as shown in FIG. 6 which is the circuit diagram of the 3-frequency
branching circuit wherein, for instance, the internal terminal 23
(refer to FIG. 1) is connected to the branching means 3 via the
diode D1. In such a 3-frequency branching circuit, on transmitting
and receiving of W-CDMA for instance, (a) although the signal loss
increases a little because the diode D1 exists on the signal route,
(b) the occurrence of the signal distortion is reduced because only
the diode D3 is the diode to be in the off state.
[0266] Moreover, as shown in FIG. 7 which is an explanatory view of
the 3-frequency branching circuit having a low-pass filter 11
inserted between the branching means 3 and a switching circuit 2
(moreover, the duplexer 4 (omitted in the drawing) is connected to
the terminal R x 2 or the terminal R x), the 3-frequency branching
circuit of the present invention may have the low-pass filter
inserted between the branching means and the second switching
circuit. In such a 3-frequency branching circuit, on transmitting
and receiving of DCS for instance, the low-pass filter 11 (a) curbs
the signal distortion occurring due to an amplifier (omitted in the
drawing) in synergy with the low-pass filter 13, and (b) reduces
the signal distortion occurring due to the diode D1 to be in the
off state.
[0267] In addition, as shown in FIG. 8 which is an explanatory view
of the 3-frequency branching circuit having grounding resistor R
shared between the switching circuits 1 and 2 (moreover, the
duplexer 4 (omitted in the drawing) is connected to the terminal R
x 2 or the terminal R x) , the 3-frequency branching circuit of the
present invention may have grounding resistor shared between the
first switching circuit and the second switching circuit (in this
case, resistors R1 to R3 (refer to FIG. 1) are unnecessary). In
such a 3-frequency branching circuit, on transmitting of GSM (DCS,
W-CDMA) for instance, the diodes D1, D3 and D5 (diodes D2 and D4)
generates little signal distortion because a reverse bias voltage
is applied.
[0268] In short, the present invention is the branching circuit
having the filter function of passing the transmitting frequency
band and the receiving frequency band in each of the first to Nth
frequency bands for instance, and is equipped with the first and
second internal terminals, the antenna terminal of connecting to
the antenna, and the branching means having the first filter of
passing the n+1-th (2.ltoreq.n.ltoreq.N-1) to Nth frequency bands
between the first internal terminal and the antenna terminal and
the second filter of passing the first to nth frequency bands
between the second internal terminal and the antenna terminal, the
first switching circuit connected to the first internal terminal of
switching between the transmitting frequency bands and the
receiving frequency bands of the n+1-th to Nth frequency bands, the
second switching circuit connected to the second internal terminal
of switching between the transmitting frequency bands of the first
frequency band and the second to the nth frequency bands and the
receiving frequency bands of the second to the nth frequency bands,
and the duplexer of branching the transmitting frequency band and
the receiving frequency band of the first frequency band.
[0269] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized in that at least one of
the above described plurality of switching circuits includes the
diode, for instance.
[0270] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized in that, for instance,
the above described first switching circuit has the first diode of
which anode is connected to the transmitting circuit side of the
above-mentioned third frequency band and cathode is connected to
the above described branching circuit, the first strip line of
which one end is connected to the anode of the above described
first diode and other end is grounded via the first capacitor and
also connected to the first control terminal, the second diode of
which anode is connected to the receiving circuit side of the
above-mentioned third frequency band and cathode is grounded via
the second capacitor and a parallel circuit of the first resistor,
and the second strip line of which one end is connected to the
anode of the above described second diode and other end is
connected to the above described branching circuit, and the above
described second switching circuit has the third diode of which
anode is connected to the transmitting circuit side of the
above-mentioned second frequency band and cathode is connected to
the above described branching circuit side, the third strip line of
which one end is connected to the anode of the above described
third diode and other end is grounded via the third capacitor and
also connected to the second control terminal, the fourth diode of
which anode is connected to the receiving circuit side of the
above-mentioned second frequency band and cathode is connected to
the above described branching circuit side, and the fourth strip
line of which one end is connected to the anode of the above
described fourth diode and other end is grounded via the fourth
capacitor and connected to the third control terminal, the fifth
diode of which anode is connected to the transmitting and receiving
circuit side of the above described first frequency band and
cathode is grounded via the fifth capacitor and the parallel
circuit of the second resistor, and the fifth strip line of which
one end is connected to the anode of the above described fifth
diode and other end is connected to the above described branching
circuit.
[0271] In addition, the present invention is the above-mentioned
3-frequency branching circuit wherein the duplexer is connected to
the third diode portion, for instance.
[0272] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized by having at least one
low-pass filter between a transmitting circuit terminal of the
above described second frequency band and the antenna terminal, for
instance.
[0273] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized by having the
configuration in which a coaxial type resonator is used for the
above described duplexer, for instance.
[0274] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized by having the
configuration in which a layered filter using a dielectric green
sheet is used for the above described duplexer, for instance.
[0275] In addition, as shown in FIGS. 9 (a) to (b) , for instance,
the present invention is the above-mentioned 3-frequency branching
circuit characterized by having the configuration in which a SAW
filter is used for the above described duplexer. Moreover, FIG. 9
(a) is an explanatory view of the 3-frequency branching circuit
(front) equipped with the SAW filter and FIG. 9 (b) is an
explanatory view of the same 3-frequency branching circuit
(backside), for instance.
[0276] Moreover, as to the above-mentioned, the duplexer may be
constituted as a device different from other means (in this case,
the third internal terminal of the present invention is the
terminal of connecting the duplexer provided substantially outside
the above described other means).
[0277] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described duplexer is comprised of the notch filter and band pass
filter, and the signal of the transmitting frequency band is
transmitted via the notch filter and the signal of the receiving
frequency band is transmitted via the band-pass filter, for
instance.
[0278] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described notch filter is comprised of the layered filter, and the
above described band-pass filter is comprised of the coaxial type
resonator, for instance.
[0279] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described notch filter is comprised of the layered filter, and the
above described band-pass filter is comprised of the SAW filter,
for instance.
[0280] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described first filter is a low-pass filter of passing the low
frequency band and the above described second filter is a high-pass
filter of passing the high frequency band, for instance.
[0281] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described first filter is the low-pass filter of passing the low
frequency band and the above described second filter is the band
pass filter of passing the high frequency band, for instance.
[0282] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described first filter and second filter are comprised of
multilayered products using the dielectric green sheets, for
instance.
[0283] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described first switching circuit and/or the second switching
circuit are/is constituted by mounting a switching element on the
multilayered product using the dielectric green sheets, for
instance.
[0284] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized in that the above
described duplexer and multilayered product are formed by
dielectrics mutually having different dielectric constants, for
instance.
[0285] In addition, as shown in FIGS. 10 (a) to (b), the present
invention is the above-mentioned 3-frequency branching circuit
characterized by having the configuration in which the above
described duplexer is mounted on the multilayered product, for
instance. Moreover, FIG. 10 (a) is an explanatory view of the
3-frequency branching circuit (front) equipped with a duplexer on a
multilayered product and FIG. 10 (b) is an explanatory view of the
same 3-frequency branching circuit (backside), for instance.
[0286] Moreover, as shown in FIGS. 11 (a) to (b), the present
invention is the above-mentioned 3-frequency branching circuit
characterized in that the above described duplexer is formed inside
the above described multilayered product, for instance.
Incidentally, FIG. 11 (a) is an explanatory view of the 3-frequency
branching circuit (front) equipped with the duplexer in the
multilayered product and FIG. 11 (b) is an explanatory view of the
same 3-frequency branching circuit (backside).
[0287] In addition, the present invention is the above-mentioned
3-frequency branching circuit characterized by having the
configuration in which an FET switch is used for at least one of
the above described first and second switching circuits, for
instance.
[0288] Moreover, the present invention is the above-mentioned
3-frequency branching circuit characterized by being a system
method in which, of the above described plurality of frequency
bands, the frequency band passing through the duplexer performs the
simultaneous transmitting and receiving, for instance.
[0289] In addition, the present invention is radio communication
equipment characterized by having an antenna of transmitting and
receiving the signal, the above-mentioned 3-frequency branching
circuit of inputting and outputting the above described transmitted
and received signal, and signal processing means of processing the
signal branched by the above-mentioned 3-frequency branching
circuit, for instance.
[0290] (Second Embodiment)
[0291] Hereafter, the 3-frequency branching circuit according to a
second embodiment of the present invention will be described by
referring to FIG. 12, while taking as a concrete example the
circuit of the filter of passing the transmitting frequency bands
and receiving frequency bands of the three frequencies of the GSM
and DCS methods used in the mobile communication in Europe and the
W-CDMA method expected to be introduced in future. Moreover, FIG.
12 shows a circuit diagram of the 3-frequency branching circuit
according to the second embodiment.
[0292] In FIG. 12, a transmitting and receiving signal from an
antenna terminal 3101 as a common terminal of the transmitting and
receiving of GSM, the transmitting and receiving of W-CDMA and the
transmitting and receiving of DCS are branched into the
transmitting and receiving signal of GSM, the transmitting and
receiving signal of W-CDMA and the transmitting and receiving
signal of DCS by a branching circuit 3102 comprised of the low-pass
filter and high-pass filter having a function of branching the low
frequency band and high frequency band.
[0293] The transmitting and receiving signal of GSM branched by the
branching circuit 3102 is branched into the transmitting signal and
receiving signal of GSM by a first transmitting and receiving
switching circuit 104 from a first internal terminal 3103 (refer to
FIG. 12 <1>) which is a transmitting and receiving terminal
of GSM. The transmitting and receiving signal of W-CDMA and the
transmitting and receiving signal of DCS branched by the branching
circuit 3102 are branched into the transmitting and receiving
signal of W-CDMA and the transmitting and receiving signal of DCS
by a 2-frequencieswitching circuit 3106 from a second internal
terminal 3105 (refer to FIG. 12 <2>) which is a 2-frequency
common terminal.
[0294] The transmitting and receiving signal of DCS branched by the
2-frequencieswitching circuit 3106 is branched into the
transmitting signal and receiving signal of DCS by a second
transmitting and receiving switching circuit 3108 from a third
internal terminal 3107 (refer to FIG. 12 <3>) which is the
transmitting and receiving terminal of DCS. The transmitting and
receiving signal of W-CDMA branched by the 2-frequencieswitching
circuit 3106 is branched into the transmitting signal and receiving
signal of W-CDMA by a duplexer 3110 from a fourth terminal 3109
(refer to FIG. 12 <4>) which is the transmitting and
receiving terminal of W-CDMA.
[0295] As described above, this embodiment allows simultaneous
receiving of GSM and W-CDMA or DCS by performing the following
around the antenna so as to implement the 3-frequency branching
circuit including the W-CDMA method requiring the simultaneous
transmitting and receiving. (1) To use the branching circuit of
branching the low frequency band and high frequency band to branch
the transmitting and receiving signal of GSM from the transmitting
and receiving signal of W-CDMA and the transmitting and receiving
signal of DCS, (2) and branch the transmitting and receiving signal
of W-CDMA and the transmitting and receiving signal of DCS on the
2-frequencieswitching circuit. Furthermore, the transmitting and
receiving switching circuits 3104 and 3108 do not pass a current
for receiving of GSM and DCS, leading to reduction in current
consumption.
[0296] Moreover, it has the configuration wherein two
2-frequencieswitching circuits (the 2-frequencieswitching circuit
3106 and the second transmitting and receiving switching circuit
3108) are passed through between the second internal terminal 3105
and the third internal terminal 3107 which is the transmitting and
receiving terminal of DCS, so that isolation between W-CDMA
terminals (W-CDMA TX and W-CDMA RX) and DCS terminals (DCS TX and
DCS RX) is improved and distortion characteristics to mutual
transmitting signals are also improved.
[0297] (Third Embodiment)
[0298] Next, the configuration and operation of the 3-frequency
branching circuit according to a third embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to this embodiment are
almost the same as those in the above-mentioned first embodiment,
the configuration and operation of the multilayered product of the
3-frequency branching circuit will be described as a major
difference by referring to FIGS. 13 to 15. Moreover, FIG. 13 is a
perspective view of the multilayered product constituting the
3-frequency branching circuit according to this embodiment, FIG. 14
is an exploded perspective view thereof, and FIG. 15 is an
equivalent circuit diagram thereof.
[0299] In FIG. 13, a multilayered product 3201 using the dielectric
green sheet of the 3-frequency branching circuit is formed by a
large number of the dielectric layers, and external electrodes
3202, 3203, 3204, 3205, 3206, 3207, 3208, 3209, 3210 and 3211 are
provided on and in the proximity of the sides of the multilayered
product 3201.
[0300] In FIG. 14, the layer A has a first ground electrode 3301
formed therein. In addition, the layer B has first, second, third,
fourth and fifth resonator electrodes 3302, 3303, 3304, 3305 and
3306 formed therein, and furthermore, the layer C has first and
second capacitor coupling electrodes 3307 and 3308 formed therein.
Moreover, the layer D has third, fourth, fifth and sixth capacitor
coupling electrodes 3309, 3310, 3311, 3312 and first and second
strip line electrodes 3313 and 3314 formed therein. The layers E, F
and G have seventh, eighth and ninth capacitor coupling electrodes
3315, 3316 and 3317 formed therein. Furthermore, the layer H has a
second ground electrode 3318 formed therein.
[0301] An external electrode 3209 is the transmitting terminal of
W-CDMA, and the strip line electrode 3314 is connected thereto.
Furthermore, as for the external electrode 3209, the capacitor
coupling electrode 3317 is connected to the ground by the ground
electrode 3318.
[0302] One end of the strip line electrode 3314 is connected to one
end of the capacitor coupling electrode 3312, and the capacitor
coupling electrode 3312 is connected to the resonator electrode
3302 via the layers C and D. The other end of the capacitor
coupling electrode 3312 is connected to one end of the capacitor
coupling electrode 3311, and the capacitor coupling electrode 3311
is connected to the resonator electrode 3303 via the layers C and
D.
[0303] The other end of the capacitor coupling electrode 3311 is
connected to one end of the strip line electrode 3313, one end of
the strip line electrode 3313 is connected to one end of the
capacitor coupling electrode 3316 via the layers E and F, and the
other end of the capacitor coupling electrode 3316 is connected to
the ground by the external electrode 3207, and furthermore, the
other end of the strip line electrode 3313 is connected to the
external electrode 3202 (refer to FIG. 13) which is a fourth
terminal (refer to FIG. 12 <4>) so as to form the notch
filter structure.
[0304] The external electrode 3205 (refer to FIG. 13) is the
receiving terminal of W-CDMA, and is connected to one end of the
capacitor coupling electrode 3315. The capacitor coupling electrode
3315 is connected to the resonator electrode 3304 via the layers C,
D and E, and the resonator electrode 3304 is connected to the
capacitor coupling electrode 3307 via the layer C, and the
capacitor coupling electrode 3307 is connected to the resonator
electrode 3305 via the layer C. In addition, the resonator
electrode 3305 is connected to the capacitor coupling electrode
3308 via the layer C, and the capacitor coupling electrode 3308 is
connected to the resonator electrode 3306 via the layer C, and
furthermore, the capacitor coupling electrode 3307 is connected to
the capacitor coupling electrode 3308 via the layer D.
[0305] The resonator electrode 3306 is connected to the capacitor
coupling electrode 3310 via the layers C and D, and the capacitor
coupling electrode 3310 is connected to the external electrode 3202
(refer to FIG. 13) which is the fourth terminal (refer to FIG. 12
<4>) so as to form the band-pass filter structure. Moreover,
the external electrodes 3203, 3204, 3206, 3207, 3208, 3210 and 3211
(refer to FIG. 13) form the ground electrode.
[0306] As described above, according to this embodiment, it is
possible to implement a smaller size by using a layered type
duplexer, and a coupling portion of the notch filter passing the
transmitting frequency band of W-CDMA can curb waves by two to
three times more than the transmitting frequency band of W-CDMA by
implementing the low-pass filter structure of LC. As above, this
embodiment was described in detail by taking the layered type
duplexer as an example, but it is also possible to implement the
smaller size by using the SAW (surface acoustic wave) filter as the
duplexer.
[0307] Moreover, as shown in FIG. 16, it is possible, according to
requirement characteristics, to reduce losses by using a combined
configuration of constituting with the coaxial type resonator a
notch filter 3501 passing the transmitting frequency band of W-CDMA
of the duplexer and constituting with a multilayered product 3502
the band pass filter passing the receiving frequency band of W-CDMA
of the duplexer.
[0308] In addition, as shown in FIG. 17, it is possible, according
to the requirement characteristics, to implement the smaller size
by using the combined configuration of constituting with the
coaxial type resonator a notch filter 3601 passing the transmitting
frequency band of W-CDMA of the duplexer and constituting with a
surface acoustic wave filter 3602 the band pass filter passing the
receiving frequency band of W-CDMA of the duplexer.
[0309] Furthermore, as shown in FIG. 18, it is possible, according
to the requirement characteristics, to implement the smaller size
by using the combined configuration of constituting with the
multilayered product a notch filter 3701 passing the transmitting
frequency band of W-CDMA of the duplexer and constituting with a
surface acoustic wave filter 3702 the band pass filter passing the
receiving frequency band of W-CDMA of the duplexer.
[0310] (Fourth Embodiment)
[0311] Next, the configuration and operation of the 3-frequency
branching circuit according to a fourth embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to the fourth
embodiment of the present invention are almost the same as those in
the above-mentioned first embodiment, the following will be
described as the major differences therefrom by referring to FIG.
19. (1) A branching filter of branching the low frequency band in
the transmitting and receiving frequency band of GSM and the high
frequency band in the transmitting and receiving frequency band of
W-CDMA and DCS, (2) the switching circuit of switching among the
transmitting and receiving frequency bands of W-CDMA, DCS and GSM,
(3) the switching circuit of switching between the transmitting
frequency band of DCS and the receiving frequency band of DCS, and
(4) a connection terminal of the duplexer of switching between the
transmitting frequency band of W-CDMA and the receiving frequency
band of W-CDMA. Moreover, FIG. 19 is an equivalent circuit diagram
of the 3-frequency branching circuit according to this
embodiment.
[0312] In FIG. 19, reference numeral 3801 denotes a first branching
circuit, 3802 denotes a first transmitting and receiving switching
circuit, 3803 denotes the 2-frequencieswitching circuit, 3804
denotes a second transmitting and receiving switching circuit, and
3805 denotes the duplexer. A first strip line L801, a second strip
line L802 and a first capacitor C801 in FIG. 19 form the low-pass
filter of passing a low frequency as shown by a waveform 1 in the
example of a branching circuit characteristic shown in FIG. 20, and
the second strip line L802 and first capacitor C801 are serially
connected to the ground side so as to form an attenuation pole
point A (refer to FIG. 20).
[0313] In addition, a second capacitor C802, a third strip line
L803 and a third capacitor C803 in FIG. 19 form the high-pass
filter of passing a high frequency as shown by a waveform 2 in FIG.
20, and the third strip line L803 and third capacitor C803 are
serially connected to the ground side so as to form an attenuation
pole point B (refer to FIG. 20).
[0314] A connection is made via such low-pass filter and high-pass
filter to an antenna terminal 3806 which is the common terminal of
the transmitting and receiving signal of GSM, the transmitting and
receiving signal of W-CDMA and the transmitting and receiving
signal of DCS so that, when transmitting or receiving a low
frequenciesignal such as the transmitting and receiving signal of
GSM, isolation is well provided to the low frequenciesignal by the
attenuation pole B on the high-pass filter side from a contact A
(refer to FIG. 19) and the signal will not be leaked to the
high-pass filter side.
[0315] Moreover, when transmitting or receiving a high
frequenciesignal such as the transmitting and receiving signals of
W-CDMA and those of DCS, the isolation is well provided to the high
frequenciesignal by the attenuation pole A on the low-pass filter
side from the contact A (refer to FIG. 19) and the signal will not
be leaked to the low-pass filter side. To be more specific, the
branching circuit 3801 provides the function of branching the low
frequenciesignal such as the transmitting and receiving signal of
GSM and the high frequenciesignal such as the transmitting and
receiving signal of W-CDMA and that of DCS. In addition, the
contact A (refer to FIG. 19) is connected to the antenna terminal
3806 via a fourth capacitor C804. The transmitting and receiving
signal of GSM branched by the branching circuit 3801 is transmitted
via a contact B (refer to FIG. 19) of the first transmitting and
receiving switching circuit.
[0316] A transmitting circuit side terminal 3807 of GSM in the
first transmitting and receiving switching circuit 3802 is
connected to the anode of a first diode P801 via a fifth capacitor
C805, and the cathode of the diode P801 is connected to the contact
B. Furthermore, one end of a fourth strip line L804 is connected
between the anode of the first diode P801 and the fifth capacitor
C805, and the other end of the fourth strip line L804 is connected
to a first control terminal 3808.
[0317] The other end of the fourth strip line L804 is further
connected to the ground via a sixth capacitor C806, and the first
control terminal 3808 plays a role of switching the transmitting
and receiving signal of one of transmitting and receiving
change-over switches of GSM. In addition, the first diode P801 has
a fifth strip line L805 and a series circuit of a seventh capacitor
C807 connected in parallel thereto.
[0318] A receiving circuit side terminal 3809 of GSM in the first
transmitting and receiving switching circuit 3802 is connected to
the anode of a second diode P802 via an eighth capacitor C808. The
cathode of the second diode P802 is connected to the ground via a
resistor R801 and a parallel circuit of a ninth capacitor C809. The
anode of the second diode P802 is further connected to one end of a
sixth strip line L806, and the other end of the sixth strip line
L806 is connected to the contact B (refer to FIG. 19) The
transmitting and receiving signals of W-CDMA and DCS branched by
the branching circuit 3801 are transmitted via a contact C (refer
to FIG. 19) of the first transmitting and receiving switching
circuit.
[0319] A fourth terminal 3810 on the W-CDMA side of the
2-frequencieswitching circuit 3803 is connected to the anode of a
third diode P803 via a tenth capacitor C810, and the cathode of the
third diode P803 is connected to the contact C. Furthermore, one
end of a seventh strip line L807 is connected between the anode of
the third diode P803 and the tenth capacitor C810, and the other
end of the seventh strip line L807 is connected to a second control
terminal 3811.
[0320] The other end of the seventh strip line L807 is further
connected to the ground via an eleventh capacitor C811, and the
second control terminal 3811 plays a role of switching between the
W-CDMA transmitting and receiving signal and the DCS transmitting
and receiving signal. In addition, the third diode P803 further has
an eighth Strip line L808 and a series circuit of a twelfth
capacitor C812 connected in parallel thereto. Moreover, the
internal terminal 3810 is connected to the duplexer 3805, and the
duplexer 3805 is connected to a W-CDMA transmitting side terminal
3812 and a receiving side terminal 3813.
[0321] An internal terminal 3814 on the DCS side in the
2-frequencieswitching circuit 3803 is connected to the anode of a
fourth diode P804 via a thirteenth capacitor C813, and the cathode
of the fourth diode P804 is connected to the ground via a resistor
R802 and the parallel circuit of a fourteenth capacitor C814. In
addition, the anode of the fourth diode P804 is further connected
to one end of a ninth strip line L809, and the other end of the
ninth strip line L809 is connected to the contact C (refer to FIG.
19). The transmitting and receiving signal of DCS branched by the
2-frequencieswitching circuit 3803 is transmitted via a contact D
(refer to FIG. 19) of the second transmitting and receiving
switching circuit.
[0322] A transmitting circuit side terminal 3815 of DCS of the
second transmitting and receiving switching circuit 3804 is
connected to the anode of a fifth diode P805 via a fifteenth
capacitor C815, and the cathode of the fifth diode P805 is
connected to the contact D. Furthermore, one end of a tenth strip
line L810 is connected between the anode of the fifth diode P805
and the fifteenth capacitor C815, and the other end of the tenth
strip line L810 is connected to a third control terminal 3816. The
other end of the tenth strip line L810 is further connected to the
ground via a sixteenth capacitor C816, and the third control
terminal 3816 plays a role of switching between the transmitting
and receiving of the DCS. In addition, the fifth diode P805 further
has an eleventh strip line L811 and the series circuit of a
seventeenth capacitor C817 connected in parallel thereto.
[0323] A receiving circuit side terminal 3817 of DCS in the second
transmitting and receiving switching circuit 3804 is connected to
the anode of a sixth diode P806 via an eighteenth capacitor C818.
The cathode of the sixth diode P806 is connected to the ground via
a resistor R803 and a parallel circuit of a nineteenth capacitor
C819. The anode of the sixth diode P806 is further connected to one
end of a twelfth strip line L812, and the other end of the twelfth
strip line L812 is connected to the contact D (refer to FIG.
19).
[0324] The transmitting and receiving signal of W-CDMA branched by
the 2-frequency branching circuit 3803 is transmitted to the
duplexer 3805 via the internal terminal 3810 on the W-CDMA side. As
a configuration of the duplexer, it is possible to render the
3-frequency branching circuit smaller-size and reduce the losses by
implementing the configuration shown in the second embodiment.
[0325] Moreover, the same results can be obtained by adding
inductance elements instead of the resistors R801, R802 and R803
and putting the resistors R801, R802 and R803 between the fourth
strip line L804 and the first control terminal 3808, between the
seventh strip line L807 and the second control terminal 3811, and
between the tenth strip line L810 and the third control terminal
3816 respectively.
[0326] In the case of transmitting by GSM, the first diode P801 and
second diode P802 will be in the on state by applying a positive
voltage to the first control terminal 3808. At this time, the
capacitors C804, C805, C806 and C808 cut a DC component, and so the
current does not run to each terminal. A current value can be
controlled by rendering the resistor R801 variable, and the signal
transmitted from a transmitting terminal 3807 is not transmitted to
the receiving side because impedance of the sixth strip line L806
becomes an infinite size due to the second diode P802 connected to
the ground side.
[0327] Moreover, as the inductance component of the second diode
P802 resonates with the capacitor C809, it is possible to render
the impedance infinite when seeing the receiving side from the
contact B at the transmitting frequency of the transmitting signal,
and the transmitting signal is transmitted to the antenna terminal
3806 through the low-pass filter of the branching circuit 3801.
[0328] Next, on receiving, the first diode P801 and second diode
P802 are in the off state because no voltage is applied to the
first control terminal 3808 so that the signal is transmitted to
the receiving side of GSM. At this time, as there is a capacitance
component of the first diode P801, the receiving signal is not
always transmitted from the antenna to the receiving terminal 3809,
and so the capacitance component of the first diode P801 is
resonated with the fifth strip line L805. It is thereby possible to
take the isolation of the transmitting terminal 3807 satisfactorily
from the contact A at the receiving frequency of the receiving
signal so that the receiving signal can be transmitted from the
antenna terminal 3806 to the receiving terminal 3809 of GSM via the
low-pass filter.
[0329] Next, the cases of branching the transmitting and receiving
signal of W-CDMA or that of DCS will be described. The third diode
P803 and the fourth diode P804 will be in the on state by applying
the positive voltage to the second control terminal 3811. At this
time, the capacitors C810, C811, C812 and C813 cut the DC
component, and so the current does not run to each terminal.
[0330] A current value can be controlled by rendering the resistor
R802 variable, and the signal transmitted and received from the
fourth terminal 3810 on the W-CDMA side is not transmitted to the
DCS side because impedance of the ninth strip line L809 becomes
infinite due to the fourth diode P804 connected to the ground
side.
[0331] At this time, the inductance component of the fourth diode
P804 resonates with the capacitor C814, it is possible to render
the impedance infinite when seeing the DCS side from the contact C
at the frequency of W-CDMA, and the transmitting and receiving
signal of W-CDMA is transmitted to the antenna terminal 3806
through the high-pass filter of the branching circuit 3801. The
internal terminal 3810 on the W-CDMA side is connected to the
duplexer 3805, and the duplexer 3805 is connected to the
transmitting side terminal 3812 and the receiving side terminal
3813 of W-CDMA, allowing the simultaneous transmitting and
receiving by W-CDMA.
[0332] In addition, on operation of DCS, no voltage is applied to
the second control terminal 811 so that the third diode P803 and
the fourth diode P804 are in the off state, and the transmitting
and receiving signal of DCS is transmitted to the antenna terminal
3806 via the high-pass filter of the branching circuit 3801. At
this time, as there is the capacitance component of the third diode
P803, the transmitting and receiving signal of DCS is not always
transmitted to the antenna terminal 3806, and so the capacitance
component of the third diode P803 is resonated with the eighth
strip line L808. It is thereby possible to take the isolation of
the internal terminal 3810 on the W-CDMA side satisfactorily from
the contact C against the receiving frequency of the transmitting
and receiving signal of DCS so that the transmitting and receiving
signal of DCS can be efficiently transmitted from the antenna
terminal 3806 via the high-pass filter of the branching circuit
3801.
[0333] In the case of transmitting by DCS, the fifth diode P805 and
sixth diode P806 will be in the on state by applying the positive
voltage to the third control terminal 3814. At this time, the
capacitors C815, C816, C817 and C818 cut the DC component, and so
the current does not run to each terminal. The current value can be
controlled by rendering the resistor R803 variable, and the signal
transmitted from the transmitting terminal 3815 is not transmitted
to the receiving side because the impedance of the twelfth strip
line L812 becomes infinite due to the sixth diode P806 connected to
the ground side. Moreover, as the inductance component of the sixth
diode P806 resonates with the capacitor C819, it is possible to
render the impedance infinite when seeing the receiving side from
the contact D at the transmitting frequency of the transmitting
signal, and the transmitting signal is transmitted to the antenna
terminal 3806 through the 2-frequencieswitching circuit 3803 and
the high-pass filters of the branching circuit 3801.
[0334] Next, on receiving, the fifth diode P805 and sixth diode
P806 are in the off state because no voltage is applied to the
third control terminal 3816 so that the signal is transmitted to
the receiving side of DCS.
[0335] At this time, as there is a capacitance component of the
fifth diode P805, the receiving signal is not always transmitted
from the antenna to the receiving terminal 3816, and so the
capacitance component of the fifth diode P805 is resonated with the
eleventh strip line L811. It is thereby possible to take the
isolation of the transmitting terminal 3815 satisfactorily from the
contact D at the receiving frequency of the receiving signal so
that the receiving signal can be transmitted from the antenna
terminal 3806 to the receiving terminal 3809 of DCS via the
high-pass filter of the branching circuit 3801 and the
2-frequencieswitching circuit 3803.
[0336] Moreover, in the case of transmitting and receiving by DCS,
no voltage is applied to the second control terminal 3811 as
previously mentioned.
[0337] As described above, as for the transmitting and receiving
signal of GSM, the transmitting and receiving signal of W-CDMA and
the transmitting and receiving signal of DCS, this embodiment
allows the simultaneous receiving of GSM and W-CDMA or DCS and also
the simultaneous transmitting and receiving of W-CDMA by providing
the branching circuit comprised of the low-pass filter of passing
the low frequency and the high-pass filter of passing the high
frequency immediately below the antenna terminal and placing the
2-frequencieswitching circuit on the terminal on the high
frequencieside, and after the branching, the duplexer on the W-CDMA
side, and the transmitting and receiving switching circuit on the
DCS side.
[0338] In addition, it is possible to eliminate undesired signals
by two or three times of the waves of the transmitting frequency
bands of the W-CDMA and DCS by using the band pass filter for the
high-pass filter portion of the branching circuit 3801.
[0339] Moreover, the 3-frequency branching circuit may have the
configuration as shown in FIG. 21. The difference from FIG. 19 is
that the 2-frequencieswitching circuit 3803 is directly connected
with the second transmitting and receiving switching circuit 3804
not via the thirteenth capacitor C813. In this case, when
transmitting W-CDMA, the positive voltage is applied to the second
control terminal 3811 and the reverse bias voltage is provided to
the fifth diode P805 without cutting a direct current, so that the
distortion generated by applying high power to the fifth diode P805
when it is off is improved. In addition, when transmitting DCS, the
positive voltage is applied to the third control terminal 3814 and
the reverse bias voltage is provided to the third diode P803
without cutting the direct current, so that the distortion
generated by applying the high power to the third diode P803 when
it is off is improved.
[0340] Moreover, as for this configuration, the same effect can be
obtained, as shown in FIG. 22, by connecting the contact C to the
contact D via a strip line 4101. In this case, the strip line 4101
has the function, as a choke coil, of blocking leaking of the
signal of the frequency on the W-CDMA side to the DCS side.
[0341] (Fifth Embodiment)
[0342] Next, the configuration of the 3-frequency branching circuit
according to a fifth embodiment of the present invention will be
described. FIG. 23 is a perspective view of the configuration of
the 3-frequency branching circuit. In FIG. 23, it has the
configuration wherein a second multilayered product 4202 is placed
on a first multilayered product 4201. In addition, first to sixth
pin diodes P801, P802, P803, P804, P805 and P806 and the first to
third resistors R801, R802 and R803 are placed on the top face of
the first multilayered product. Moreover, the diodes may be
welding-packaged, bare chip-packaged or flip chip-packaged, and the
resistor may be a printed resistor.
[0343] The first multilayered product 4201 is formed by a large
number of dielectric layers, and internal layers have a circuit
configuration including a branching circuit 4801, first and second
transmitting and receiving switching circuits 4802 and 4804 and a
2-frequencieswitching circuit 4803. In addition, the first
multilayered product 4201 also has the function of a laminated
substrate, and a plurality of terminal electrodes 4203 are formed
around it. The terminal electrodes 4203 are connected to the
respective circuits formed in the internal layers. Moreover, the
terminal electrodes 4203 are the ground electrodes, control
terminals and transmitting and receiving terminals of various
methods, and are appropriately placed by external circuit
configuration.
[0344] It is preferable to use the dielectric of which specific
inductive capacity is 10 or less for the dielectric of the first
multilayered product 4201, and it may have the configuration
wherein a crystal phase includes at least one of Al.sub.2O.sub.3,
MgO, SiO.sub.2 and ROa (R is at least one element selected from La,
Ce, Pr, Nd, Sm and Gd, and a is a numerical value
stoichiometrically determined according to the value of the above
described R). The second multilayered product 4202 is formed by a
large number of dielectric layers, and the duplexer is formed in
the internal layer. It is preferable to use the dielectric of which
specific inductive capacity is comparatively large for the
dielectric of the second multilayered product 4202, and it may be
have the configuration wherein main components are Bi.sub.2O.sub.3,
and Nb.sub.2O.sub.5. In addition, the terminal electrodes 4203 can
have the same effect if formed not around it but on the bottom face
of it.
[0345] In addition, while the second multilayered product 4202 is
placed on a top surface of the first multilayered product 4201 in
this embodiment, it may also be the placement configuration wherein
the first multilayered product 4201 and the second multilayered
product 4202 are separated and arranged sideways on a substrate
4301 as shown in FIG. 24. In this case, the circuit configuration
in the internal layer of the first multilayered product 4201 is
formed with an allowance to allow the isolation among the elements
to be enhanced by increasing the ground electrodes for instance and
also to allow height of the second multilayered product 4202 to be
higher, and so the thickness of the resonator in the internal layer
can be increased so as to further reduce the losses.
[0346] In addition, on the top surface of the first multilayered
product 4201 it is possible to have an inductor (or the strip line)
and the capacitor in the internal layers of the first multilayered
product 4201 mounted as discrete parts. These are placed as
appropriate according to the characteristics of the 3-frequency
branching circuit. In addition, placement of other parts is not
limited thereto but they are placed as appropriate according to an
internal layer pattern and a terminal position. As described above,
in this embodiment, it is possible to implement the smaller size by
having the transmitting and receiving switching circuits,
2-frequencieswitching circuits and duplexer formed by the
multilayered products.
[0347] Moreover, while this embodiment was described in detail by
taking the layered type duplexer as an example, it is also possible
to implement the smaller size by using the SAW filter utilizing the
surface acoustic wave as the duplexer. In addition, it is also
possible, according to the requirement characteristics, to
implement it by combining the coaxial type, layered type and SAW
filter.
[0348] The above description was made on the second to fifth
embodiments of the present invention in detail.
[0349] Moreover, the branching circuit of the present invention was
the 3-frequency branching circuit exemplified by the GSM, W-CDMA
and DCS in the above-mentioned second to fifth embodiments.
However, not limiting thereto, the branching circuit of the present
invention is, in short, the branching circuit having the filter
function of passing the transmitting frequency band and receiving
frequency band in each of the first to Nth frequency bands, and is
equipped with the first, second, third and fourth internal
terminals, the antenna terminal of connecting to the antenna, and
the branching means having the first filter of passing the n+1-th
(2.ltoreq.n.ltoreq.N-1) to Nth frequency bands between the first
internal terminal and the antenna terminal and the second filter of
passing the first to nth frequency bands between the second
internal terminal and the antenna terminal, the first switching
circuit connected to the first internal terminal of switching among
the n+1-th to Nth frequency bands, the second switching circuit
connected to the second internal terminal of switching the second
to the nth frequency bands to the third internal terminal and
switching the first frequency band to the fourth internal terminal
for transmission, the third switching circuit connected to the
third internal terminal of switching among the second to the nth
frequency bands, and the duplexer connected to the fourth internal
terminal of branching the transmitting frequency band and the
receiving frequency band of the first frequency band (in addition,
the branching circuit of the present invention may be the one
having interchanged the roles of the input and output in such a
branching circuit).
[0350] In addition, mobile communication equipment of the present
invention is characterized by having the antenna of transmitting
and receiving the signal, the branching circuit of the present
invention (3-frequency branching circuit) of inputting and
outputting the transmitted and received signal, and the signal
processing means of processing the signal branched by the branching
circuit (3-frequency branching circuit) , and it is applicable, by
using the 3-frequency branching circuit of the present invention,
to the mobile communication equipment of the W-CDMA method or the
like requiring the simultaneous transmitting and receiving.
[0351] Thus, according to the present invention, for instance, it
allows the simultaneous receiving of GSM and W-CDMA or DCS by using
the branching circuit of branching the low frequency band and high
frequency band around the antenna portion to branch the GSM
transmitting and receiving signal from the W-CDMA and DCS
transmitting and receiving signals first and using the
2-frequencieswitching circuit to branch the W-CDMA transmitting and
receiving signal from the DCS transmitting and receiving signal,
and it also allows the simultaneous transmitting and receiving of
W-CDMA by branching the transmitting and receiving frequencies of
the W-CDMA transmitting and receiving signals with the
duplexer.
[0352] In addition, it is possible, according to the requirement
characteristics, to implement the 3-frequency branching circuit of
the smaller size and reduced losses by using in the duplexer
portion the coaxial type duplexer using the coaxial type resonator
if reduction in losses is required, the duplexer of the layered
type or using the SAW filter if the smaller size is required, and
further combining them, and it is feasible to provide the
3-frequency branching circuit, branching circuit and radio
communication equipment also usable for the system wherein the TDMA
method and the W-CDMA method assuring high tone quality and high
speed data communication for instance are mixed.
[0353] (Sixth Embodiment)
[0354] Hereafter, the 3-frequency branching circuit according to a
sixth embodiment of the present invention will be described by
referring to FIG. 25, while taking as a concrete example the
circuit of the filter of passing the transmitting frequency bands
and receiving frequency bands of the three frequencies of the GSM
and DCS methods used in the mobile communication in Europe and the
W-CDMA method expected to be introduced in future. Moreover, FIG.
25 shows a circuit diagram of the 3-frequency branching circuit
according to the sixth embodiment.
[0355] In FIG. 25, reference numeral 101 denotes the duplexer of
which band widths are broad bands such as 880 to 960 MHz as the
transmitting and receiving frequency band of GSM, 1710 to 1980 MHz
as the transmitting frequency band of W-CDMA and the transmitting
and receiving frequency band of DCS and 2110 to 2170 MHz as the
receiving frequency band of W-CDMA, and having the function of
branching narrow bands among the bands. 880 to 960 MHz as the
transmitting and receiving frequency band of GSM and 1710 to 1980
MHz as the transmitting frequency band of W-CDMA and the
transmitting and receiving frequency band of DCS are branched first
from an antenna terminal 102 to a first internal terminal 103 which
is the common terminal of the transmitting and receiving of GSM,
the transmitting of W-CDMA and the transmitting and receiving of
DCS or to a second internal terminal 104 which is the receiving
terminal of W-CDMA.
[0356] The transmitting and receiving signals from the first
internal terminal 103 which is the common terminal of the
transmitting and receiving of GSM, the transmitting of W-CDMA and
the transmitting and receiving of DCS are branched by a branching
circuit 105 comprised of the low-pass filter and high-pass filter
having the function of branching the low frequency band and high
frequency band so that the transmitting and receiving signal of GSM
is branched to a transmitting and receiving switching circuit
(hereafter, also referred to as the first transmitting and
receiving change-over switch) 106 side and the transmitting signal
of W-CDMA and the transmitting and receiving signal of DCS are
branched to a transmitting and receiving switching circuit
(hereafter, also referred to as the second transmitting and
receiving change-over switch) 107 side respectively.
[0357] The transmitting and receiving signal of GSM branched by the
branching circuit is branched into the transmitting signal and
receiving signal of GSM by the first transmitting and receiving
switching circuit 106.
[0358] In addition, the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS branched by the branching
circuit is branched into the transmitting signal of W-CDMA and the
transmitting signal of DCS and receiving signal of DCS by the
second transmitting and receiving switching circuit 107.
[0359] As described above, this embodiment allows the simultaneous
receiving of W-CDMA, GSM and DCS by using the duplexer around the
antenna portion so as to (1) branch the W-CDMA receiving signal
first and (2) branch the GSM transmitting and receiving signal from
the W-CDMA transmitting signal and the DCS transmitting and
receiving signal by using the branching circuit of branching the
low frequency band and high frequency band.
[0360] Furthermore, the transmitting and receiving switching
circuits 106 and 107 do not pass a current on receiving of GSM and
DCS not to mention receiving of W-CDMA, leading to reduction in
current consumption, and in addition, it also has the effect of
rendering the circuit scale smaller, implementing the smaller size
and reducing insertion losses by simultaneously performing the
transmitting of W-CDMA and the transmitting of DCS.
[0361] Moreover, in the case of taking the circuit configuration
described above, the receiving signal of W-CDMA is branched first
by the duplexer around the antenna portion and so the receiving
signal of W-CDMA can be received in a low-loss state so that high
tone quality is assured for instance.
[0362] (Seventh Embodiment)
[0363] Next, the configuration and operation of the 3-frequency
branching circuit according to a seventh embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to this embodiment are
almost the same as those in the above-mentioned sixth embodiment,
the configuration and operation of the coaxial type duplexer of the
3-frequency branching circuit as the major differences will be
described by referring to FIGS. 26 to 28. Moreover, FIG. 26 is an
equivalent circuit diagram of the coaxial type duplexer, FIG. 27 is
a top view of thereof, and FIG. 28 is a characteristic view
thereof.
[0364] In FIG. 26, a common terminal 201 for the transmitting and
receiving of GSM, the transmitting of W-CDMA and the transmitting
and receiving of DCS is connected to a first capacitor C201
connected to the ground and a first inductor L201.
[0365] The other end of the first inductor L201 is connected to a
coaxial type resonator Res 201 via a second capacitor C202. In
addition, a third capacitor C203 is connected to the ground and
further a second inductor L202 is connected thereto.
[0366] The other end of the second inductor L202 is connected to a
coaxial type resonator Res 202 via a fourth capacitor C204, and a
fifth capacitor C205 connected to the ground and a third inductor
L203 are further connected thereto.
[0367] The other end of the third inductor L203 is connected to an
antenna terminal 202 connected to the antenna.
[0368] A receiving terminal 203 of W-CDMA is connected to a sixth
capacitor C206, and the other end of the sixth capacitor C206 is
connected to a coaxial type resonator Res 203 in parallel, and to a
seventh capacitor C207 and further to an eighth capacitor C208.
[0369] The other end of the eighth capacitor C208 is connected to a
coaxial type resonator Res 204 in parallel, and to a ninth
capacitor C209.
[0370] The other end of the ninth capacitor C209 is connected to a
coaxial type resonator Res 205 in parallel, and to the other end of
the seventh capacitor C207 and further to a tenth capacitor C210,
and to the antenna terminal 202.
[0371] The coaxial type duplexer comprised of such equivalent
circuits will be described further by referring to FIG. 27.
[0372] In FIG. 27, a wiring substrate P301 is made of a resin such
as glass epoxy. In addition, the coaxial type resonator Res 201 to
205 are made of dielectrics and so on, and are mounted on the
wiring substrate P301 by soldering together with the inductor
elements such as an air core coil and a chip capacitor.
[0373] The substrate P301 has external electrodes 301, 302, 303,
304, 305, 306, 307, 308, 309 and 310 provided thereon. Moreover,
the external electrode 301 is the common terminal of the
transmitting and receiving of GSM, the transmitting of W-CDMA and
the transmitting and receiving of DCS, the external electrode 309
is the antenna terminal, the external electrode 307 is the
receiving terminal of W-CDMA, and the external electrodes 302, 303,
304, 305, 306, 308 and 310 have the ground terminals placed
thereon.
[0374] Next, the characteristics of the duplexer will be described
by referring to FIG. 28.
[0375] In FIG. 28, a waveform 1 is a waveform diagram of the
transmitting and receiving signal of GSM, the transmitting signal
of W-CDMA and the transmitting and receiving signal of DCS.
[0376] In the waveform 1, the transmitting and receiving frequency
band of GSM, the transmitting frequency band of W-CDMA and the
transmitting and receiving frequency band of DCS are passed by
using the notch filter. Moreover, selectivity is improved by
attenuating the receiving frequency band of W-CDMA.
[0377] A waveform 2 is a waveform diagram of the receiving signal
of W-CDMA. In the waveform 2, the receiving frequency band of
W-CDMA is passed by using the band pass filter. Moreover,
selectivity is improved by attenuating the transmitting and
receiving frequency band of GSM, the transmitting frequency band of
W-CDMA and the transmitting and receiving frequency band of
DCS.
[0378] As described above, it is possible, according to this
embodiment, to reduce the insertion losses of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA, the
transmitting and receiving signal of DCS and the receiving signal
of W-CDMA by using the coaxial type duplexer. And the coupling
portion of the notch filter passing the transmitting and receiving
band of GSM, the transmitting frequency band of W-CDMA and the
transmitting and receiving band of DCS has the configuration of the
low-pass filter of LC so that it can curb waves by two to three
times more than the transmitting frequency band of DCS or
W-CDMA.
[0379] (Eighth Embodiment)
[0380] Next, the configuration and operation of the 3-frequency
branching circuit according to an eighth embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to this embodiment are
almost the same as those in the above-mentioned sixth embodiment,
the configuration and operation of the multilayered product of the
3-frequency branching circuit as the major differences will be
described by referring to FIGS. 29 to 31. Moreover, FIG. 29 is a
perspective view of the multilayered product constituting the
3-frequency branching circuit according to this embodiment, FIG. 30
is an exploded perspective view thereof, and FIG. 31 is an
equivalent circuit diagram thereof.
[0381] In FIG. 29, a multilayered product 501 using the dielectric
green sheet of the 3-frequency branching circuit is formed by a
large number of dielectric layers, and external electrodes 502,
503, 504, 505, 506, 507, 508, 509, 510 and 511 are provided on and
in the proximity of the side of the multilayered product 501.
[0382] In FIG. 30, the layer A has a first ground electrode 601
formed thereon. In addition, the layer B has first, second, third,
fourth and fifth resonator electrodes 602, 603, 604, 605 and 606
formed thereon, and the layer C has first and second capacitor
coupling electrodes 607 and 608 formed thereon.
[0383] In addition, the layer D has third, fourth, fifth and sixth
capacitor coupling electrodes 609, 610, 611 and 612 and first and
second strip line electrodes 613 and 614 formed thereon.
[0384] The layers E, F and G have seventh, eighth and ninth
capacitor coupling electrodes 615, 616 and 617 formed thereon.
Furthermore, the layer H has a second ground electrode 618 formed
thereon.
[0385] The external electrode 509 is the common terminal of the
transmitting and receiving of GSM, the transmitting of W-CDMA and
the transmitting and receiving of DCS, and is connected to the
strip line electrode 614. Furthermore, the external electrode 509
has the capacitor coupling electrode 617 connected to the ground by
the ground electrode 618.
[0386] One end of the strip line electrode 614 is connected to one
end of the capacitor coupling electrode 612, and the capacitor
coupling electrode 612 is connected to the resonator electrodes 602
via the layers C and D.
[0387] The other end of the capacitor coupling electrode 612 is
connected to one end of the capacitor coupling electrode 611, and
the capacitor coupling electrode 611 is connected to the resonator
electrode 603 via the layers C and D.
[0388] The other end of the capacitor coupling electrode 611 is
connected to one end of the strip line electrode 613, the one end
of the strip line electrode 613 is connected to one end of the
capacitor coupling electrode 616 via the layers E and F, and the
other end of the capacitor coupling electrode 616 is connected to
the ground by the external electrode 507, and furthermore, the
other end of the strip line electrode 613 is connected to the
external electrode 502 which is the antenna terminal so as to form
the notch filter structure.
[0389] The external electrode 505 (refer to FIG. 29) is the
receiving terminal of W-CDMA, and is connected to one end of the
capacitor coupling electrode 615.
[0390] The capacitor coupling electrode 615 has the resonator
electrode 604 connected thereto via the layers C, D and E, and the
resonator electrode 604 has the capacitor coupling electrode 607
connected thereto via the layer C, and the capacitor coupling
electrode 607 has the resonator electrode 605 connected thereto via
the layer C. In addition, the resonator electrode 605 has the
capacitor coupling electrode 608 connected thereto via the layer C,
and the capacitor coupling electrode 608 has the resonator
electrode 606 connected thereto via the layer C, and furthermore,
the capacitor coupling electrode 607 has the capacitor coupling
electrode 608 connected thereto via the layer D.
[0391] The resonator electrode 606 has the capacitor coupling
electrode 610 connected thereto via the layers C and D, and the
capacitor coupling electrode 610 is connected to the external
electrode 502 (refer to FIG. 29) which is the antenna terminal so
as to form the band pass filter structure. Moreover, the external
electrodes 503, 504, 506, 507, 508, 510 and 511 (refer to FIG. 29)
form the ground electrode.
[0392] As described above, according to this embodiment, it is
possible to implement the smaller size by using the layered type
duplexer, and it is also possible to curb the waves by two to three
times more than the transmitting frequency bands of DCS and W-CDMA
for instance by implementing the low-pass filter structure of LC
with the coupling portion of the notch filter passing the
transmitting and receiving frequency band of GSM, the transmitting
frequency band of W-CDMA and the transmitting and receiving
frequency band of DCS.
[0393] As above, this embodiment was described in detail by taking
the layered type duplexer as an example, but it is also possible to
implement the smaller size by using the SAW filter utilizing the
surface acoustic wave as the duplexer.
[0394] Moreover, as shown in FIG. 32, it is possible, according to
the requirement characteristics, to implement the smaller size by
using a combination of a notch filter 801 passing the transmitting
and receiving frequency band of GSM, the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS of the coaxial type duplexer and a band pass filter 802 passing
the receiving frequency band of W-CDMA of the layered type
duplexer.
[0395] In addition, as shown in FIG. 33, it is possible, according
to the requirement characteristics, to implement the smaller size
by using a coaxial type notch filter 901 passing the transmitting
and receiving frequency band of GSM, the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS of the coaxial type duplexer and using a SAW filter 902
utilizing a surface acoustic wave as the band pass filter passing
the receiving frequency band of W-CDMA.
[0396] Furthermore, as shown in FIG. 34, it is possible, according
to the requirement characteristics, to further implement the
smaller size by using a layered type notch filter 1001 passing the
transmitting and receiving frequency band of GSM, the transmitting
frequency band of W-CDMA and the transmitting and receiving
frequency band of DCS of the layered type duplexer and using a SAW
filter 1002 utilizing a surface acoustic wave as the band pass
filter passing the receiving frequency band of W-CDMA.
[0397] (Ninth Embodiment)
[0398] Next, the configuration and operation of the 3-frequency
branching circuit according to a ninth embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to this embodiment are
almost the same as those in the above-mentioned sixth embodiment,
the following will be described as the major differences therefrom
by referring to FIG. 35. (1) The branching filter of branching the
low frequency band in the transmitting and receiving frequency band
of GSM from the high frequency band in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS, (2) the switching circuit of switching between the
transmitting and receiving of the low frequency band in the
transmitting and receiving frequency band of GSM, (3) the switching
circuit of switching between the transmitting and receiving of the
high frequency band in the transmitting frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS. Moreover,
FIG. 35 is an equivalent circuit diagram of the 3-frequency
branching circuit according to this embodiment.
[0399] In FIG. 35, reference numeral 1101 denotes a first
transmitting and receiving switching circuit, 1102 denotes a second
transmitting and receiving switching circuit, and 1103 denotes the
branching circuit.
[0400] A GSM transmitting circuit side terminal 1104 in the first
transmitting and receiving switching circuit 1101 has the anode of
a first diode P1101 connected thereto via a first capacitor C1101,
and the cathode of the diode P1101 is connected to the contact A.
Furthermore, one end of a first strip line L1101 is connected
between the anode of the first diode P1101 and the first capacitor
C1101, and the other end of the first strip line L1101 is connected
to a control terminal 1105.
[0401] The other end of the first strip line L 1101 is further
connected to the ground via a second capacitor C1102, and the
control terminal 1105 plays a role of switching the transmitting
and receiving signal of one of the GSM transmitting and receiving
change-over switches. In addition, the first diode P1101 has a
second strip line L1102 and the series circuit of a third capacitor
C1103 connected thereto in parallel.
[0402] A GSM receiving circuit side terminal 1106 in the first
transmitting and receiving switching circuit 1101 has the anode of
a second diode P1102 connected thereto via a fourth capacitor
C1104. The cathode of the second diode P1102 is connected to the
ground via a resistor R1101 and the parallel circuit of a fifth
capacitor C1105. The anode of the second diode P1102 further has
one end of a third strip line L1103 connected thereto, and the
other end of the third strip line L1103 is connected to the contact
A.
[0403] The first transmitting and receiving switching circuit 1101
is connected to one end of a fourth strip line L1104 at the contact
A, and the other end of the fourth strip line L1104 is connected to
a common terminal 1107 of the GSM transmitting and receiving
signal, the W-CDMA transmitting signal and DCS transmitting and
receiving signal via a sixth capacitor C1106 through the contact C.
In addition, the one end of the fourth strip line L1104 is
connected to the ground side via a fifth strip line L1105 and the
series circuit of a seventh capacitor C1107.
[0404] A W-CDMA and DCS transmitting circuit side terminal 1108 in
the second transmitting and receiving switching circuit 1102 has
the anode of a third diode P1103 connected thereto via an eighth
capacitor C1108, and the cathode of the third diode P1103 is
connected to the contact B. Furthermore, one end of a sixth strip
line L1106 is connected between the anode of the third diode P1103
and the eighth capacitor C1108, and the other end of the sixth
strip line L1106 is connected to a control terminal 1109.
[0405] The other end of the sixth strip line L1106 is connected to
the ground via a ninth capacitor C1109, and the control terminal
1109 plays a role of switching the transmitting and receiving
signal of one of the W-CDMA and DCS transmitting and receiving
change-over switches. In addition, the third diode P1103 further
has a seventh strip line L1107 and the series circuit of a tenth
capacitor C1110 connected in parallel.
[0406] A DCS receiving circuit side terminal 1110 in the second
transmitting and receiving switching circuit 1102 has the anode of
a fourth diode P1104 connected thereto via an eleventh capacitor
C1111, and the cathode of the fourth diode P104 is connected to the
ground via a resistor R1102 and the parallel circuit of a twelfth
capacitor C1112. In addition, the anode of the fourth diode P1104
further has one end of an eighth strip line L1108 connected
thereto, and the other end of the eighth strip line L1108 is
connected to the contact B.
[0407] The second transmitting and receiving switching circuit 1102
is connected to a thirteenth capacitor C1113 at the contact B, and
is connected to the common terminal 1107 of the GSM transmitting
and receiving signal, the W-CDMA transmitting signal and DCS
transmitting and receiving signal via the sixth capacitor C1106
through the contact C. In addition, the one end of the thirteenth
capacitor C1113 is connected to the ground via a ninth strip line
L1109 and the series circuit of a fourteenth capacitor C1114.
[0408] Moreover, the same results can be obtained by adding the
inductance elements instead of the resistors R1101 and R1102 and
putting the resistors R1101 and R1102 between the first strip line
L1101 and the control terminal 1105 and between the sixth strip
line L1106 and the control terminal 1109 respectively.
[0409] Next, the following operation will be described while
referring to FIG. 36. (1) The branching filter of branching the low
frequency band in the transmitting and receiving frequency band of
GSM from the high frequency band in the transmitting frequency band
of W-CDMA and the transmitting and receiving frequency band of DCS,
(2) the switching circuit of switching between the transmitting and
receiving of the low frequency band in the transmitting and
receiving frequency band of GSM, (3) the switching circuit of
switching between the transmitting and receiving of the high
frequency band in the transmitting frequency band of W-CDMA and the
transmitting and receiving frequency band of DCS. Moreover, FIG. 36
is a characteristic view of the duplexer of the 3-frequency
branching circuit according to this embodiment.
[0410] The fourth strip line L1104, the fifth strip line L1105 and
the seventh capacitor C1107 in FIG. 35 form the low-pass filter of
passing the low frequency as shown by the waveform 1 in FIG. 36,
and the fifth strip line L1105 and the seventh capacitor C1107 are
serially connected to the ground side so as to form the attenuation
pole point A (refer to FIG. 36).
[0411] In addition, the thirteenth capacitor C1113, the ninth strip
line L1109 and the fourteenth capacitor C1114 in FIG. 35 form the
high-pass filter of passing the high frequency as shown by the
waveform 2 in FIG. 26, and the ninth strip line L1109 and the
fourteenth capacitor C1114 are serially connected to the ground
side so as to form the attenuation pole point B (refer to FIG.
36).
[0412] A connection is made via such low-pass filter and high-pass
filter to the common terminal of the GSM transmitting and receiving
signal, the W-CDMA transmitting signal and DCS transmitting and
receiving signal so that, when transmitting or receiving the low
frequenciesignal such as the transmitting and receiving signal of
GSM, the isolation is well provided to the low frequenciesignal by
the attenuation pole B on the high-pass filter side from the
contact C (refer to FIG. 35) and the signal will not be leaked to
the high-pass filter side.
[0413] Moreover, when transmitting or receiving the high
frequenciesignal such as the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS, the isolation is well
provided to the high frequenciesignal by the attenuation pole A on
the low-pass filter side from the contact C (refer to FIG. 35) and
the signal will not be leaked to the low-pass filter side. To be
more specific, the branching circuit 1107 provides the function of
branching the low frequenciesignal such as the transmitting and
receiving signal of GSM and the high frequenciesignal such as the
transmitting signal of W-CDMA or transmitting and receiving signal
of DCS.
[0414] In case of transmitting the low frequenciesuch as the
transmitting signal GSM, the first diode P1101 and the second diode
P1102 will be in the on state by applying the positive voltage to
the control terminal 1105.
[0415] At this time, the capacitors C1101, C1104 and C1106 cut the
DC component, and so the current does not run to each terminal. The
current value can be controlled by rendering the resistor R1101
variable, and the signal transmitted from the transmitting terminal
1104 is not transmitted to the receiving side because the impedance
of the second strip line L1102 becomes infinite due to the second
diode P1102 connected to the ground side. Moreover, as the
inductance component of the second diode P1102 resonates with the
capacitor C1103, it is possible to render the impedance infinite
when seeing the receiving side from the contact A at the
transmitting frequency of the transmitting signal, and the
transmitting signal is transmitted to the common terminal 1107 of
the transmitting and receiving signal of GSM, the transmitting
signal of W-CDMA and transmitting and receiving signal of DCS
through the low-pass filter.
[0416] Next, on receiving, the first diode P1101 and second diode
P1102 are in the off state because no voltage is applied to the
control terminal 1105 so that the signal is transmitted to the
receiving side from the common terminal of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA and
transmitting and receiving signal of DCS.
[0417] At this time, as there is the capacitance component of the
first diode P1101, the receiving signal is not always transmitted
from the antenna to the receiving terminal 1106, and so the
capacitance component of the first diode P1101 is resonated with
the third strip line L1103. It is thereby possible to take the
isolation of the transmitting terminal 1104 satisfactorily from the
contact A at the receiving frequency of the receiving signal so
that the receiving signal can be transmitted via the low-pass
filter to the receiving terminal 1107 of GSM from the common
terminal 1107 of the transmitting and receiving signal of GSM, the
transmitting signal of W-CDMA and transmitting and receiving signal
of DCS.
[0418] Next, the cases of transmitting the high frequenciesuch as
the transmitting signal of W-CDMA or the transmitting and receiving
signal of DCS will be described.
[0419] The third diode P1103 and the fourth diode P1104 will be in
the on state by applying the positive voltage to the control
terminal 1109. At this time, the capacitors C1108, C1111 and C1106
cut the DC component, and so the current does not run to each
terminal.
[0420] The current value can be controlled by rendering the
resistor R1102 variable, and the signal transmitted from the
transmitting terminal 1108 of W-CDMA and DCS is not transmitted to
the receiving side because impedance of the eighth strip line L1108
becomes infinite due to the fourth diode P1104 connected to the
ground side.
[0421] At this time, as the inductance component of the fourth
diode P1104 resonates with the capacitor C1112, it is possible to
render the impedance infinite when seeing the receiving side from
the contact B at the transmitting frequency of the transmitting
signal, and the transmitting signals of W-CDMA and DCS are
transmitted to the common terminal 1107 of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA and
transmitting and receiving signal of DCS through the high-pass
filter.
[0422] In addition, on receiving DCS, no voltage is applied to the
control terminal 1109 so that the third diode P1103 and the fourth
diode P1104 are in the off state, and the receiving signal of DCS
is transmitted to the receiving side from the common terminal of
the transmitting and receiving signal of GSM, the transmitting
signal of W-CDMA and transmitting and receiving signal of DCS.
[0423] At this time, as there is the capacitance component of the
third diode P1103, the receiving signal of DCS is not always
transmitted to the receiving terminal 1110 from the common terminal
of the transmitting and receiving signal of GSM, the transmitting
signal of W-CDMA and transmitting and receiving signal of DCS, and
so the capacitance component of the third diode P1103 is resonated
with the seventh strip line L117. It is thereby possible to take
the isolation of the transmitting terminal 1108 satisfactorily from
the contact B against the receiving frequency of the receiving
signal of DCS so that the receiving signal of DCS can be
efficiently transmitted via the high-pass filter to the receiving
terminal 1110 of DCS from the common terminal 1107 of the
transmitting and receiving signal of GSM, the transmitting signal
of W-CDMA and transmitting and receiving signal of DCS.
[0424] As described above, this embodiment provides the low-pass
filter of passing the low frequency through the common terminal of
the transmitting and receiving signal of GSM, the transmitting
signal of W-CDMA and transmitting and receiving signal of DCS and
the high-pass filter of passing the high frequency through it, and
provides the circuit of dividing the transmitting and receiving
signals of GSM on the low-pass filter side, and also provides the
circuit of dividing the transmitting and receiving as to the
transmitting signals of W-CDMA and DCS and the receiving signal of
DCS on the high-pass filter side so as to allow the transmitting
and receiving of the three frequencies.
[0425] In addition, it provides the low-pass filter of passing the
low frequency through the common terminal of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA and
transmitting and receiving signal of DCS and the high-pass filter
of passing the high frequency through it. It is possible to
eliminate undesired signals of the waves by two to three times more
than the transmitting frequency band of W-CDMA and DCS by using the
band pass filter in the high-pass filter portion of the branching
circuit.
[0426] (Tenth Embodiment)
[0427] Next, the configuration and operation of the 3-frequency
branching circuit according to a tenth embodiment of the present
invention will be described. As the configuration and operation of
the 3-frequency branching circuit according to this embodiment are
almost the same as those in the above-mentioned sixth embodiment,
the following will be described as the major differences therefrom
by referring to FIGS. 37 to 39. (1) The branching filter of
branching the high frequency band in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS from the low frequency band in the transmitting and receiving
frequency band of GSM, (2) the switching circuit of switching
between the transmitting and receiving of the low frequency band in
the transmitting and receiving frequency band of GSM, (3) the
switching circuit of switching between the transmitting and
receiving of the high frequency band in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS. Moreover, FIG. 37 is a perspective view of the multilayered
product of the branching filter of branching the low frequency band
of the transmitting and receiving frequency band of GSM and the
high frequency band of the transmitting frequency band of W-CDMA
and transmitting and receiving frequency band of DCS according to
this embodiment. In addition, FIGS. 38 and 39 are exploded
perspective views of the lower half and upper half of the means
including the switching circuit of switching the low frequency band
of the transmitting and receiving frequency band of GSM and the
switching circuit of switching the transmitting and receiving of
the high frequency band of the transmitting frequency band of
W-CDMA and transmitting and receiving frequency band of DCS
respectively.
[0428] In FIG. 37, a multilayered product 1301 is formed by a large
number of dielectric layers, wherein there are the branching filter
of branching the low frequency band in the transmitting and
receiving frequency band of GSM and the high frequency bands in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS, the switching circuit of switching
between the transmitting and receiving of the low frequency band in
the transmitting and receiving frequency band of GSM, and the
switching circuit of switching between the transmitting and
receiving of the high frequency bands in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS.
[0429] External electrodes 1302a, 1302b, 1302c, 1302d, 1302e,
1302f, 1302g, 1302h, 1302I, 1302j, 1302k, 1302l, 1302m, 1302n,
1302o and 1302p are provided on and in the proximity of the sides
of the multilayered product 1301.
[0430] In addition, the diodes P1101, P1102, P1103 and P1104 and
the resistor R1101, and R1102 are mounted on the top face of the
multilayered product 1301 by soldering and so on. Moreover, the
diodes may be bare chip-packaged or flip chip-packaged, and the
resistor may be a printed resistor.
[0431] In FIG. 38, the layer A has a first ground electrode 1401
formed therein. In addition, the layer B has second, fifth, ninth
and twelfth capacitor coupling electrodes 1402, 1403, 1404 and 1405
formed therein, and furthermore, the layer C has a second ground
electrode 1406 formed therein.
[0432] The layers D and E have third and eighth strip line
electrodes 1407a, 1407b, 1408a and 1408b formed therein by dividing
them in two layers. The layer F has a strip line electrode 1409 of
the first strip line formed therein. The layer G has a third ground
electrode 1410 and a strip Line electrode 1411 of the sixth strip
line formed therein.
[0433] In FIG. 39, the layer H has a strip line electrode 1412 of
the fifth strip line, a capacitor coupling electrode 1413 of the
seventh capacitor and a capacitor coupling electrode 1414 of the
fourteenth capacitor formed therein.
[0434] The layer I has capacitor coupling electrodes 1415a, 1416a
and 1417a on one side each of the third, tenth and thirteenth
capacitors formed therein, and the layer J has capacitor coupling
electrodes 1415b, 1416b and 1417b on the one side each of the
third, tenth and thirteenth capacitors formed therein. The layer K
has capacitor coupling electrodes 1415c and 1416c on the other side
each of the third and tenth capacitors formed therein. The layer L
has capacitor coupling electrodes 1418a, 1419a, 1420, 1421a and
1422a on one side each of the first, second, eighth, eleventh and
sixth capacitors formed therein, and further has strip line
electrodes 1423, 1424, 1425 and 1426 of the second, fourth, seventh
and ninth strip lines. The layer M has capacitor coupling
electrodes 1418b, 1419b, 1421b and 1422b on one side each of the
first, second, eleventh and sixth capacitors formed therein. The
layer N has the first, second, third and fourth diodes P1101,
P1102, P1103 and P1104 and the first and second resistor R1101, and
R1102 mounted thereon.
[0435] Moreover, it goes without saying that the layers A to N
described above are layered in this order.
[0436] The external electrode 1302n (refer to FIG. 37) has the
capacitor coupling electrode 1402 connected thereto, and the
capacitor coupling electrode 1402 is sandwiched between the ground
electrodes 1401 and 1406 and connected to the ground. Furthermore,
the external electrode 1302n is connected to one end of the strip
line electrode 1409, and the other end of the strip line electrode
1409 is connected to the capacitor coupling electrodes 1418a, 1415a
and 1415c and to the anode side of the diode P1101 through a via
hole. The external electrode 1302n plays a role of the control
terminal, and is connected to an external control circuit.
[0437] The external electrode 1302f (refer to FIG. 37) has the
capacitor coupling electrode 1418b forming a capacitor with the
capacitor coupling electrode 1418a connected thereto. The capacitor
coupling electrode 1415b sandwiched between the capacitor coupling
electrodes 1415a and 1415c is connected to the cathode side of the
diode P1101 via the strip line electrode 1423 through the via
hole.
[0438] The external electrode 1302p (refer to FIG. 37) has the
capacitor coupling electrode 1419a connected thereto, and the
capacitor coupling electrode 1419b forming the capacitor with the
capacitor coupling electrode 1419a is connected to the anode of the
diode P1102 through the via hole.
[0439] Moreover, the cathode side of the diode P1102 is connected
to one end of the resistor R1101, and the other end of the resistor
R1101 is connected to the ground from the external electrode 1302o
through the via hole. In addition, the cathode side of the diode
P1102 is connected to the capacitor coupling electrode 1405 through
the via hole, and is connected to the ground via the ground
electrodes 1401 and 1406.
[0440] Furthermore, the capacitor coupling electrode 1419b is
connected to the cathode side of the diode P1101 via the strip line
electrodes 1407a and 1407b through the via hole. The cathode side
of the diode P1101 is connected to one end of the strip line 1425
through the via hole, and the other end of the strip line 1425 is
connected to the capacitor coupling electrode 1422b through the via
hole.
[0441] The capacitor coupling electrode 1422a forming the capacitor
with the capacitor coupling electrode 1422b is connected to the
external electrode 1302j (refer to FIG. 37). In addition, one end
of the strip line 1425 has one end of the strip line 1412 connected
thereto, and the other end of the strip line 1412 is connected to
the capacitor coupling electrode 1413 to be connected to the ground
via the ground electrode 1410.
[0442] The external electrode 1302i (refer to FIG. 37) has the
capacitor coupling electrode 1404 connected thereto, and the
capacitor coupling electrode 1404 is sandwiched between the ground
electrodes 1401 and 1406 to be connected to the ground.
[0443] The external electrode 1302i (refer to FIG. 37) is connected
to one end of the strip line electrode 1411, and the other end of
the strip line electrode 1411 is connected to the capacitor
coupling electrodes 1416a, 1416c and to the anode side of the diode
P1103 through the via hole.
[0444] The external electrode 1302i (refer to FIG. 37) plays a role
of the control terminal, and is connected to the external control
circuit.
[0445] The external electrode 1302d (refer to FIG. 37) has the
capacitor coupling electrode 1420 forming the capacitor with the
capacitor coupling electrode 1416c connected thereto. Moreover, the
capacitor coupling electrode 1416b sandwiched between the capacitor
coupling electrodes 1416a and 1416c is connected to the cathode
side of the diode P1103 via the strip line electrode 1424 through
the via hole.
[0446] The external electrode 1302b (refer to FIG. 37) has the
capacitor coupling electrode 1421b connected thereto, and the
capacitor coupling electrode 1421a forming the capacitor with the
capacitor coupling electrode 1421b is connected to the anode of the
diode P1104 through the via hole.
[0447] Moreover, the cathode side of the diode P1104 is connected
to one end of the resistor R1102, and the other end of the resistor
R1102 is connected to the ground from the external electrode 1302o
through the via hole. In addition, the cathode side of the diode
P1104 is connected to the capacitor coupling electrode 1403 through
the via hole, and is connected to the ground via the ground
electrodes 1401 and 1406.
[0448] Furthermore, the capacitor coupling electrode 1421a is
connected to the cathode side of the diode P1103 via the strip line
electrodes 1408a and 1408b through the via hole. The cathode side
of the diode P1103 is connected to the capacitor coupling electrode
1417b through the via hole, and the capacitor coupling electrode
1417a forming the capacitor with the capacitor coupling electrode
1417b is connected to the capacitor coupling electrode 1422b
through the via hole.
[0449] The capacitor coupling electrode 1417b has one end of the
strip line 1426 connected thereto, and the other end of the strip
line 1426 is connected to the capacitor coupling electrode 1416
through the via hole to be connected to the ground via the ground
electrode 1410.
[0450] Furthermore, the external electrodes 1302a, 1302c, 1302e,
1302g, 1302i, 1302k, 1302m and 1302p (refer to FIG. 37) are
connected to the ground electrodes 1401, 1406 and 1410
respectively.
[0451] In addition, the external electrode 1302f (refer to FIG. 37)
is connected to the transmitting circuit in a subsequent stage of
GSM, and the external electrode 1302p (refer to FIG. 37) is
connected to the receiving circuit in the subsequent stage of
GSM.
[0452] The external terminal 1302d (refer to FIG. 37) is connected
to the transmitting circuit in a subsequent stage of W-CDMA and
DCS, and the external electrode 1302b (refer to FIG. 37) is
connected to the receiving circuit in the subsequent stage of DCS.
Furthermore, the external terminal 1302j (refer to FIG. 37) is
connected to the common terminal of the transmitting and receiving
signal of GSM, the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS.
[0453] It is possible, by using a multilayered substrate using the
dielectrics shown in FIGS. 37 to 39, to implement the smaller sizes
of the branching filter of branching the low frequency band in the
transmitting and receiving frequency band of GSM and the high
frequency bands in the transmitting frequency band of W-CDMA and
the transmitting and receiving frequency band of DCS, the switching
circuit of switching between the transmitting and receiving of the
low frequency band in the transmitting and receiving frequency band
of GSM, and the switching circuit of switching between the
transmitting and receiving of the high frequency bands in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS of this embodiment.
[0454] In addition, it is possible to use the strip line electrodes
1409 and 1411 as stubs by rendering them n times longer than
wavelengths of the respective transmitting frequencies thereof so
as to improve selectivity of the signals.
[0455] Furthermore, as the ground electrode is formed on the bottom
face, it has an effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of a mounting substrate or
peripheral circuit parts of the mobile communication equipment.
[0456] In addition, while the strip line has one-layer or two-layer
structure in the above-mentioned embodiment, the same effect can
also be obtained by rendering it as a structure of three or more
layers.
[0457] (Eleventh Embodiment)
[0458] Next, an eleventh embodiment of the present invention will
be described by referring to FIG. 40. FIG. 40 is a perspective view
of the means integrating a layered duplexer 1501 portion of the
3-frequency branching circuit as in the eighth embodiment of the
present invention and a multilayered product 1502 portion as in the
eighth embodiment constituting the branching filter of branching
the low frequency band in the transmitting and receiving frequency
band of GSM and the high frequency bands in the transmitting
frequency band of W-CDMA and the transmitting and receiving
frequency band of DCS, the switching circuit of switching between
the transmitting and receiving of the low frequency band in the
transmitting and receiving frequency band of GSM, and the switching
circuit of switching between the transmitting and receiving of the
high frequency bands in the transmitting frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS.
[0459] It is possible, by performing such integration, to render
them smaller-size and lower-priced, and it has the effect of doing
without a matching circuit required when mounting each of them on
the mobile communication equipment by the soldering and so on.
[0460] Furthermore, as shown in FIG. 40, it is easily possible to
adjust the frequency and a degree of coupling required by the
layered duplexer by having the configuration concurrently providing
the layered duplexer portion 1501 of the 3-frequency branching
circuit and a switching circuit portion 1502 comprised of the
branching filter of branching the low frequency band in the
transmitting and receiving frequency band of GSM and the high
frequency bands in the transmitting frequency band of W-CDMA and
the transmitting and receiving frequency band of DCS, the switching
circuit of switching between the transmitting and receiving of the
low frequency band in the transmitting and receiving frequency band
of GSM, and the switching circuit of switching between the
transmitting and receiving of the high frequency bands in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS in the tenth embodiment.
[0461] Furthermore, it is possible to implement the smaller size
and lower height by mounting the pin diodes by means of wire
bonding and flip chip and using the printed resistor.
[0462] In addition, as the ground electrode is formed on the bottom
face, it has an effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of a mounting substrate or
peripheral circuit parts of the mobile communication equipment.
[0463] (Twelfth Embodiment)
[0464] Next, a twelfth embodiment of the present invention will be
described by referring to FIG. 41. Moreover, FIG. 41 is a
perspective view of the means of integrating a combination portion
1601 of the notch filter of passing the transmitting and receiving
frequency band of GSM, the transmitting frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS of the
layered duplexer of the 3-frequency branching circuit as in the
eighth embodiment of the present invention and the band pass filter
of passing the receiving frequency band of W-CDMA of the duplexer
of the SAW filter utilizing the surface acoustic wave and a
multilayered product portion 1602 constituting the branching filter
of branching the low frequency band in the transmitting and
receiving frequency band of GSM and the high frequency bands in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS, the switching circuit of switching
between the transmitting and receiving of the low frequency band in
the transmitting and receiving frequency band of GSM, and the
switching circuit of switching between the transmitting and
receiving of the high frequency bands in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS.
[0465] It is possible, by performing such integration, to render
them smaller-size, and it has the effect of doing without the
matching circuit required when mounting each of them on the mobile
communication equipment by the soldering and so on.
[0466] Furthermore, it is possible to implement the smaller size
and lower height by mounting the pin diodes by means of wire
bonding and flip chip and using the printed resistor.
[0467] In addition, as the ground electrode is formed on the bottom
face, it has an effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of a mounting substrate or
peripheral circuit parts of the mobile communication equipment.
[0468] (Thirteenth Embodiment)
[0469] Next, a thirteenth embodiment of the present invention will
be described by referring to FIG. 42. Moreover, FIG. 42 is a
perspective view of the multilayered product integrating a
switching portion 1701 of a 1 input-4 output or 1 input-5 output
GaAs (gallium arsenide) having the function of branching the
branching filter of branching the low frequency band in the
transmitting and receiving frequency band of GSM and the high
frequency bands in the transmitting frequency band of W-CDMA and
the transmitting and receiving frequency band of DCS, the switching
circuit of switching between the transmitting and receiving of the
low frequency band in the transmitting and receiving frequency band
of GSM, and the switching circuit of switching between the
transmitting and receiving of the high frequency bands in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS as in the tenth embodiment into the
transmitting signal and receiving signal of GSM, the transmitting
signal of W-CDMA, and the transmitting signal and receiving signal
of DCS and the layered type duplexer 1702 of the 3-frequency
branching circuit as in the eighth embodiment of the present
invention.
[0470] The integration allows it to become smaller-size and
lower-priced, and it has the effect of doing without the matching
circuit required when mounting each of them on the mobile
communication equipment by the soldering and so on.
[0471] Furthermore, it is possible to implement the smaller size
and lower height by mounting GaAs (gallium arsenide) by means of
the wire bonding and flip chip.
[0472] In addition, as the ground electrode is formed on the bottom
face, it has the effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of the mounting substrate or
the peripheral circuit parts of the mobile communication
equipment.
[0473] (Fourteenth Embodiment)
[0474] Next, a fourteenth embodiment of the present invention will
be described by referring to FIG. 43. Moreover, FIG. 43 is a
perspective view of the means integrating a switching portion 1801
of a 1 input-4 output or 1 input-5 output GaAs (gallium arsenide)
having the function of branching the branching filter of branching
the low frequency band in the transmitting and receiving frequency
band of GSM and the high frequency bands in the transmitting
frequency band of W-CDMA and the transmitting and receiving
frequency band of DCS, the switching circuit of switching between
the transmitting and receiving of the low frequency band in the
transmitting and receiving frequency band of GSM, and the switching
circuit of switching between the transmitting and receiving of the
high frequency bands in the transmitting frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS as in the
tenth embodiment into the transmitting signal and receiving signal
of GSM, the transmitting signal of W-CDMA, and the transmitting
signal and receiving signal of DCS respectively, and the
multilayered product portion 1802 integrating the combination of
the notch filter passing the transmitting and receiving frequency
band of GSM, the transmitting frequency band of W-CDMA and the
transmitting and receiving frequency band of DCS and the band pass
filter of passing the receiving frequency band of W-CDMA of the
duplexer of the SAW filter utilizing the surface acoustic wave of
the layered type duplexer of the 3-frequency branching circuit as
in the eighth embodiment of the present invention.
[0475] The integration allows it to become smaller-size and
lower-priced, and it has the effect of doing without the matching
circuit required when mounting each of them on the mobile
communication equipment by the soldering and so on.
[0476] Furthermore, it is possible to implement the smaller size
and lower height by mounting GaAs (gallium arsenide) and the SAW
filter by means of wire bonding and flip chip.
[0477] In addition, as the ground electrode is formed on the bottom
face, it has the effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of the mounting substrate or
the peripheral circuit parts of the mobile communication
equipment.
[0478] (Fifteenth Embodiment)
[0479] Hereafter, the configuration and operation of the
3-frequency branching circuit according to a fifteenth embodiment
of the present invention will be described by referring to FIG. 44,
while taking as an example the circuit of the filter of passing the
transmitting frequency bands and receiving frequency bands of the
three frequencies of the GSM and DCS methods used in the mobile
communication in Europe and the W-CDMA method expected to be
introduced in future. Moreover, FIG. 44 shows a circuit diagram of
the 3-frequency branching circuit according to this embodiment.
[0480] In FIG. 44, the transmitting and receiving signal from an
antenna terminal 1901 as the common terminal of the transmitting
and receiving of GSM, the transmitting and receiving of W-CDMA and
the transmitting and receiving of DCS is branched into the
transmitting and receiving signal of GSM, the transmitting and
receiving signal of W-CDMA and the transmitting and receiving
signal of DCS by a branching circuit 1902 comprised of the low-pass
filter and high-pass filter having a function of branching the low
frequency band and high frequency band.
[0481] The transmitting and receiving signal of GSM branched by the
branching circuit 1902 is branched into the transmitting signal and
the receiving signal of GSM by a first transmitting and receiving
switching circuit (hereafter, also referred to as a second
transmitting and receiving change-over switch) 1904 from the first
internal terminal 1903 which is the transmitting and receiving
terminal of GSM.
[0482] The duplexer 1905 has broad bands such as 1710 to 1980 MHz
as the transmitting frequency band of W-CDMA and the transmitting
and receiving frequency band of DCS and 2110 to 2170 MHz as the
receiving frequency band of W-CDMA, and has the function of
branching narrow bands among the bands. 1710 to 1980 MHz as the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS are branched from a second internal
terminal 1906 which is the common terminal of the transmitting
frequency band of W-CDMA, the transmitting and receiving frequency
band of DCS and the receiving frequency band of W-CDMA to a fourth
internal terminal 1907 which is the common terminal of the
transmitting of W-CDMA and the transmitting and receiving of DCS
and to a fifth internal terminal 1908 which is the receiving
terminal of W-CDMA.
[0483] Furthermore, the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS branched by a branching
circuit 1902 are branched into the transmitting signal of W-CDMA,
the transmitting signal of DCS and the receiving signal of DCS by a
second transmitting and receiving switching circuit (hereafter,
also referred to as a second transmitting and receiving change-over
switch) 1909.
[0484] In this embodiment, (1) the coaxial type duplexer described
in detail in the seventh embodiment of the present invention or (2)
the layered type duplexer described in detail in the eighth
embodiment of the present invention and the duplexer using the SAW
filter are used for the configuration of branching the transmitting
frequency band of W-CDMA, the transmitting and receiving frequency
band of DCS and the receiving frequency band of W-CDMA.
[0485] As described above, this embodiment allows the simultaneous
receiving of W-CDMA, GSM and DCS by using the branching circuit of
branching the low frequency band and high frequency band around the
antenna portion to branch the GSM transmitting and receiving signal
from the W-CDMA and DCS transmitting and receiving signals first,
using the duplexer next to branch the W-CDMA receiving signal,
using the transmitting and receiving switching circuit to branch
the GSM transmitting and receiving signal, and further using the
transmitting and receiving switching circuit to branch the W-CDMA
transmitting signal and the DCS transmitting and receiving
signal.
[0486] Furthermore, the transmitting and receiving switching
circuits 1904 and 1909 do not pass a current for the receiving of
GSM and DCS not to mention the receiving of W-CDMA, leading to
reduction in the current consumption, and besides, it also has the
effect of rendering the circuit scale smaller, implementing the
smaller size and reducing insertion losses by simultaneously
performing the transmitting of W-CDMA and the transmitting of
DCS.
[0487] Moreover, in the case of taking the circuit configuration
described above, the transmitting and receiving signal of GSM is
branched first by the branching circuit around the antenna portion
and so the transmitting and receiving signal of GSM can be
transmitted and received in a low-loss state so that high tone
quality is assured for instance.
[0488] (Sixteenth Embodiment)
[0489] Next, the configuration and operation of the 3-frequency
branching circuit according to a sixteenth embodiment of the
present invention will be described. Here, the following will be
described by referring to FIG. 45. (1) The branching filter of
branching the low frequency band in the transmitting and receiving
frequency band of GSM and the high frequency band in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS as in the fifteenth embodiment of
the present invention, (2) the switching circuit of switching
between the transmitting and receiving of the low frequency band in
the transmitting and receiving frequency band of GSM, (3) the
switching circuit of switching between the transmitting and
receiving of the high frequency band in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS. Moreover, FIG. 45 is an equivalent circuit diagram of the
3-frequency branching circuit according to this embodiment.
[0490] In FIG. 45, reference numeral 2001 denotes the first
transmitting and receiving switching circuit, 2002 denotes the
second transmitting and receiving switching circuit, and 2003
denotes the branching circuit.
[0491] A transmitting circuit side terminal 2004 of GSM on the
first transmitting and receiving switching circuit 2001 has the
anode of a first diode P2001 connected thereto via a first
capacitor C2001, and the cathode of the diode P2001 is connected to
the contact A.
[0492] Furthermore, one end of a first strip line L2001 is
connected between the anode of the first diode P2001 and the first
capacitor C2001, and the other end of the first strip line L2001 is
connected to a control terminal L2005.
[0493] The other end of the first strip line L2001 is further
connected to the ground via a second capacitor C2002, and the
control terminal 2005 plays a role of switching the transmitting
and receiving signal of one of the transmitting and receiving
change-over switches of GSM. In addition, the first diode P2001 has
a second strip line L2002 and a series circuit of a third capacitor
C2003 connected in parallel thereto.
[0494] A receiving circuit side terminal 2006 of GSM in the first
transmitting and receiving switching circuit 2001 is connected to
the anode of a second diode P2002 via a fourth capacitor C2004.
[0495] The cathode of the second diode P2002 is connected to the
ground via a resistor R2001 and the parallel circuit of a fifth
capacitor C2005. The anode of the second diode P2002 is further
connected to one end of a third strip line L2003, and the other end
of the third strip line L2003 is connected to the contact A.
[0496] The first transmitting and receiving switching circuit 2001
is connected to one end of a fourth strip line L2004 at the contact
A, and the other end of the fourth strip line L2004 is connected to
a common terminal 2007 of the transmitting and receiving signal of
GSM, the transmitting and receiving signal of W-CDMA and the
transmitting and receiving signal of DCS through the contact C and
via a sixth capacitor C2006. In addition, the one end of the fourth
strip line L2004 is connected to the ground side via a fifth strip
line L2005 and the series circuit of a seventh capacitor C2007.
[0497] A common terminal 2008 of the transmitting and receiving
signal of W-CDMA and the transmitting and receiving signal of DCS
is connected to an eighth capacitor C2008, and is connected to the
common terminal 2007 of the transmitting and receiving signal of
GSM, the transmitting and receiving signal of W-CDMA and the
transmitting and receiving signal of DCS through the contact C and
via the sixth capacitor C2006. In addition, the common terminal
2008 of the transmitting and receiving signal of W-CDMA and the
transmitting and receiving signal of DCS is connected to the ground
side via a ninth strip line L2009 and the series circuit of a
fifteenth capacitor C2015.
[0498] A transmitting circuit side terminal 2009 of W-CDMA and DCS
in the second transmitting and receiving switching circuit 2002 is
connected to the anode of a third diode P2003 via the ninth
capacitor C2009, and the cathode of the third diode P2003 is
connected to the contact B.
[0499] Furthermore, one end of a sixth strip line L2006 is
connected between the anode of the third diode P2003 and the ninth
capacitor C2009, and the other end of the sixth strip line L2006 is
connected to a control terminal 2009. In addition, the other end of
the sixth strip line L2006 is further connected to the ground via a
tenth capacitor C2010, and a control terminal 2010 plays a role of
switching the transmitting and receiving signal of one of the
transmitting and receiving change-overswitches of W-CDMA and
DCS.
[0500] The third diode P2003 further has a seventh strip line L2007
and a series circuit of an eleventh capacitor C2011 connected in
parallel thereto.
[0501] A receiving circuit side terminal 2011 of DCS in the second
transmitting and receiving switching circuit 2002 is connected to
the anode of a fourth diode P2004 via a twelfth capacitor C2012,
and the cathode of the fourth diode P2004 is connected to the
ground via a resistor R2002 and a parallel circuit of a thirteenth
capacitor C2013.
[0502] The anode of the fourth diode P2004 is further connected to
one end of an eighth strip line L2008, and the other end of the
eighth strip line L2008 is connected to the contact B.
[0503] The second transmitting and receiving switching circuit 2002
is connected to a fourteenth capacitor C2014 at the contact B, and
is connected to a common terminal 2012 of the transmitting and
receiving signal of W-CDMA and the transmitting and receiving
signal of DCS.
[0504] Moreover, the same results can also be obtained by adding
the inductance elements instead of the resistors R2001 and R2002
and putting the resistors R2001 and R2002 between the first strip
line L2001 and the control terminal 2005 and between the sixth
strip line L2006 and the control terminal 2009 respectively.
[0505] Next, the operation of the following constituted as above
will be described while referring to FIG. 36. (1) The branching
filter of branching the low frequency band in the transmitting and
receiving frequency band of GSM and the high frequency band in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS, (2) the switching circuit of
switching between the transmitting and receiving of the low
frequency band in the transmitting and receiving frequency band of
GSM, (3) the switching circuit of switching between the
transmitting and receiving of the high frequency band in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS.
[0506] The fourth strip line L2004, the fifth strip line L2005 and
the seventh capacitor C2007 form the low-pass Filter of passing the
low frequency as shown by the waveform 1 in FIG. 36, and the fifth
strip line L2005 and the seventh capacitor C2007 are serially
connected to the ground side so as to form the attenuation pole
point A (refer to FIG. 36).
[0507] In addition, the thirteenth capacitor C2013, the ninth strip
line L2009 and the fourteenth capacitor C2014 form the high-pass
filter of passing the high frequency as shown by the waveform 2 in
FIG. 36, and the ninth strip line L2009 and the fourteenth
capacitor C2014 are serially connected to the ground side so as to
form the attenuation pole point B (refer to FIG. 36).
[0508] A connection is made via such low-pass filter and high-pass
filter to the common terminal of the transmitting and receiving
signal of GSM, the transmitting and receiving signal of W-CDMA and
the transmitting and receiving signal of DCS so that, when
transmitting or receiving the low frequenciesignal such as the
transmitting and receiving signal of GSM, the isolation is well
provided to the low frequenciesignal by the attenuation pole B on
the high-pass filter side from a contact C and the signal will not
be leaked to the high-pass filter side.
[0509] Moreover, when transmitting or receiving the high
frequenciesignal such as the transmitting and receiving
frequenciesignals of W-CDMA and those of DCS, the isolation is well
provided to the high frequenciesignal by the attenuation pole A on
the low-pass filter side from the contact C and the signal will not
be leaked to the low-pass filter side.
[0510] To be more specific, the branching circuit 2003 provides the
function of branching the low frequenciesignal such as the
transmitting and receiving signal of GSM and the high
frequenciesignal such as the transmitting and receiving
frequenciesignal of W-CDMA and that of DCS.
[0511] In the case of transmitting the low frequenciesignal such as
the transmitting signal of GSM, the first diode P2001 and the
second diode P2002 will be in the on state by applying the positive
voltage to the control terminal 2005.
[0512] At this time, the capacitors C2001, C2004 and C2006 cut the
DC component, and so the current does not run to each terminal.
Moreover, the current value can be controlled by rendering the
resistor R2001 variable, and as to the signal transmitted from the
transmitting terminal 2004, the impedance of the second strip line
L2002 becomes infinite due to the second diode P2002 connected to
the ground side. Thus, the signal transmitted from the transmitting
terminal 2004 is not transmitted to the receiving side.
[0513] As the inductance component of the second diode P2002
resonates with the capacitor C2003, it is possible to render the
impedance infinite when seeing the receiving side from the contact
A at the transmitting frequency of the transmitting signal, and the
transmitting signal is transmitted to a common terminal 2007 of the
transmitting and receiving signal of GSM, the transmitting and
receiving signal of W-CDMA and the transmitting and receiving
signal of DCS through the low-pass filter.
[0514] Next, on receiving, the first diode P2001 and second diode
P2002 are in the off state because no voltage is applied to the
control terminal 2005 so that the signal is transmitted to the
receiving side from the common terminal of the transmitting and
receiving signal of GSM, the transmitting and receiving signal of
W-CDMA and the transmitting and receiving signal of DCS.
[0515] At this time, as there is the capacitance component of the
first diode P2001, the receiving signal is not always transmitted
from the antenna to the receiving terminal 2006, and so the
capacitance component of the first diode P2001 is resonated with
the third strip line L2003. It is thereby possible to take the
isolation of the transmitting terminal 2004 satisfactorily from the
contact A at the receiving frequency of the receiving signal so
that the receiving signal can be transmitted to the receiving
terminal 2006 of GSM from the common terminal 2007 of the
transmitting and receiving signal of GSM, the transmitting signal
of W-CDMA and the transmitting and receiving signal of DCS via the
low-pass filter.
[0516] Next, the cases of transmitting the high frequenciesuch as
the transmitting and receiving signal of W-CDMA or that of DCS will
be described.
[0517] The third diode P2003 and the fourth diode P2004 will be in
the on state by applying the positive voltage to the control
terminal 2010. At this time, the capacitors C2009, C2012 and C2014
cut the DC component, and so the current does not run to each
terminal.
[0518] The current value can be controlled by rendering the
resistor R2002 variable, and the signal transmitted from the
transmitting terminal 2009 of W-CDMA and DCS is not transmitted to
the receiving side because the impedance of the eighth strip line
L2008 becomes infinite due to the fourth diode P2004 connected to
the ground side.
[0519] At this time, as the inductance component of the fourth
diode P2004 resonates with the capacitor C2012, it is possible to
render the impedance infinite when seeing the receiving side from
the contact B at the transmitting frequency of the transmitting
signal, and the transmitting signal is transmitted to a common
terminal 2012 of the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS.
[0520] Next, on receiving of DCS, the third diode P2003 and fourth
diode P2004 are in the off state because no voltage is applied to
the control terminal 2010 so that the receiving signal of DCS is
transmitted to the receiving side from the common terminal of the
transmitting signal of W-CDMA and the transmitting and receiving
signal of DCS.
[0521] At this time, as there is the capacitance component of the
third diode P2003, the receiving signal of DCS is not always
transmitted to the receiving terminal 2011 from the common terminal
of the transmitting signal of W-CDMA and the transmitting and
receiving signal of DCS, and so the capacitance component of the
third diode P2003 is resonated with the seventh strip line L2007.
It is thereby possible to take the isolation of the transmitting
terminal 2009 satisfactorily from the contact B to the receiving
frequency of the receiving signal of DCS so that the receiving
signal of DCS can be efficiently transmitted to the common terminal
2012 of the transmitting signal of W-CDMA and the transmitting and
receiving signal of DCS.
[0522] As described above, this embodiment provides the low-pass
filter of passing the low frequency through the common terminal of
the transmitting and receiving signal of GSM, the transmitting
signal of W-CDMA and transmitting and receiving signal of DCS and
the high-pass filter of passing the high frequency through it, and
provides the circuit of dividing the transmitting and receiving
signals of GSM on the low-pass filter side, and also provides the
circuit of dividing the transmitting and receiving as to the
transmitting signals of W-CDMA and DCS and the transmitting signal
of DCS on the high-pass filter side so as to allow the transmitting
and receiving of the three frequencies.
[0523] In addition, it is possible to eliminate the undesired
signals of the waves by two to three times more than the
transmitting frequency band of W-CDMA and DCS by using the band
pass filter in the high-pass filter portion of the branching
circuit having the low-pass filter of passing the low frequency
through the common terminal of the transmitting and receiving
signal of GSM, the transmitting signal of W-CDMA and transmitting
and receiving signal of DCS and the high-pass filter of passing the
high frequency through it.
[0524] (Seventeenth Embodiment)
[0525] Next, the configuration and operation of the 3-frequency
branching circuit according to a seventeenth embodiment of the
present invention will be described. As the configuration and
operation of the 3-frequency branching circuit according to this
embodiment are almost the same as those in the above-mentioned
fifteenth embodiment, the configuration and operation of the
following will be described as the major differences therefrom by
referring to FIGS. 46 to 48. (1) The branching filter of branching
the low frequency band in the transmitting and receiving frequency
band of GSM and the high frequency band in the transmitting and
receiving frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS, (2) the switching circuit of
switching between the transmitting and receiving of the low
frequency band in the transmitting and receiving frequency band of
GSM, (3) the switching circuit of switching between the
transmitting and receiving of the high frequency band in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS. Moreover, FIG. 22 is a perspective
view of the multilayered product of the branching filter of
branching the low frequency band of the transmitting and receiving
frequency band of GSM and the high frequency band of the
transmitting and receiving frequency band of W-CDMA and the
transmitting and receiving frequency band of DCS according to this
embodiment. In addition, FIGS. 47 and 48 are exploded perspective
views of the upper half and lower half of the means including the
switching circuit of switching between the transmitting and
receiving of the low frequency band of the transmitting and
receiving frequency band of GSM and the switching circuit of
switching between the transmitting and receiving of the high
frequency band of the transmitting frequency band of W-CDMA and
transmitting and receiving frequency band of DCS respectively.
[0526] In FIG. 46, a multilayered product 2101 of the branching
filter of branching the low frequency band in the transmitting and
receiving frequency band of GSM and the high frequency band in the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS, the switching circuit of switching
between the transmitting and receiving of the low frequency band in
the transmitting and receiving frequency band of GSM, and the
switching circuit of switching between the transmitting and
receiving of the high frequency band in the transmitting frequency
band of W-CDMA and the transmitting and receiving frequency band of
DCS is formed by a large number of dielectric layers.
[0527] External electrodes 2102a, 2102b, 2102c, 2102d, 2102e,
2102f, 2102g, 2102h, 2102i, 2102j, 2102k, 2102l, 2102m, 2102n,
2102o and 2102p are provided on and in the proximity of the sides
of the multilayered product 2101.
[0528] In addition, the diodes P2001, P2002, P2003 and P2004 and
the resistor R2001, and R2002 are mounted on the top face of the
multilayered product 2101 by soldering and so on. Moreover, the
diodes may be bare chip-packaged or flip chip-packaged, and the
resistor may be the printed resistor.
[0529] In FIG. 47, the layer A has a first ground electrode 2201
formed therein. In addition, the layer B has second, fifth, tenth
and thirteenth capacitor coupling electrodes 2202, 2203, 2204 and
2205 formed therein, and furthermore, the layer C has a second
ground electrode 2206 formed therein.
[0530] The layers D and E have strip line electrodes 2207a, 2207b,
2208a and 2208b of the third and eighth strip lines formed therein
by dividing them in two layers. In addition, the layer F has a
strip line electrode 2209 of the first strip line and one capacitor
coupling electrode 2210a of a fourteenth capacitor formed
therein.
[0531] The layer G has a third ground electrode 2211, a strip line
electrode 2212 of the sixth strip line and the other capacitor
coupling electrode 2210b of the fourteenth capacitor formed
therein.
[0532] In FIG. 48, the layer H has a strip line electrode 2213 of
the fifth strip line, a capacitor coupling electrode 2214 of the
seventh capacitor and a capacitor coupling electrode 2215 of the
fifteenth capacitor formed therein.
[0533] The layer I has capacitor coupling electrodes 2216a, 2217a
and 2218a on one side each of the third, eleventh and eighth
capacitors formed therein, and the layer J has capacitor coupling
electrodes 2216b, 2217b and 2218b on the one side each of the
third, eleventh and eighth capacitors formed therein. The layer K
has capacitor coupling electrodes 2216c, 2217c and 2218c on the
other side each of the third, eleventh and eighth capacitors formed
therein. The layer L has capacitor coupling electrodes 2219a,
2220a, 2221a, 2222a, and 2223a on one side each of the first,
fourth, ninth, twelfth and sixth capacitors formed therein, and
further has strip line electrodes 2224, 2225, 2226, and 2227 of the
second, fourth, seventh and ninth strip lines formed therein. The
layer M has capacitor coupling electrodes 2219b, 2220b, 2222b and
2223b on one side each of the first, fourth, twelfth and sixth
capacitors formed therein. The layer N has the first, second, third
and fourth diodes P2001, P2002, P2003 and P2004 and the first and
second resistor R2001, and R2002 mounted thereon.
[0534] Moreover, it goes without saying that the layers A to N
described above are layered in this order.
[0535] The external electrode 2102n (refer to FIG. 46) has the
capacitor coupling electrode 2202 connected thereto, and the
capacitor coupling electrode 2202 is sandwiched between the ground
electrode 2201 and 2206 and connected to the ground.
[0536] Furthermore, the external electrode 2102n (refer to FIG. 46)
is connected to one end of the strip line electrode 2209, and the
other end of the strip line electrode 2209 is connected to the
capacitor coupling electrodes 2219a, 2216a and 2216c and to the
anode side of the diode P2001 through the via hole. In addition,
the external electrode 2102n plays a role of the control terminal,
and is connected to the external control circuit.
[0537] The external electrode 2102f (refer to FIG. 46) has the
capacitor coupling electrode 2219b forming a capacitor with the
capacitor coupling electrode 2219a connected thereto. The capacitor
coupling electrode 2216b sandwiched between the capacitor coupling
electrodes 2216a and 2216c is connected to the cathode side of the
diode P2001 (refer to FIG. 46) via the strip line electrode 2224
through the via hole.
[0538] The external electrode 2102p (refer to FIG. 46) has the
capacitor coupling electrode 2220a connected thereto, and the
capacitor coupling electrode 2220b forming the capacitor with the
capacitor coupling electrode 2220a is connected to the anode of the
diode P2002 through the via hole. Moreover, the cathode side of the
diode P2002 (refer to FIG. 46) is connected to one end of the
resistor R2001, and the other end of the resistor R2001 is
connected to the ground from the external electrode 2102o through
the via hole. In addition, the cathode side of the diode P2002 is
connected to the capacitor coupling electrode 2205 through the via
hole, and is connected to the ground via the ground electrodes 2201
and 2206.
[0539] The capacitor coupling electrode 2220b is connected to the
strip line electrode 2207a through the via hole, and is connected
to the cathode side of the diode P2001 via 2207b.
[0540] The cathode side of the diode P2001 (refer to FIG. 46) is
connected to one end of the strip line 2225 through the via hole,
and the other end of the strip line 2225 is connected to the
capacitor coupling electrode 2223b through the via hole.
[0541] The capacitor coupling electrode 2223a forming the capacitor
with the capacitor coupling electrode 2223b is connected to the
external electrode 2102j. In addition, one end of the strip line
2225 has one end of the strip line 2213 connected thereto, and the
other end of the strip line 2213 is connected to the capacitor
coupling electrode 2214 to be connected to the ground via the
ground electrode 2211. In addition, the other end of the strip line
2225 is connected to the capacitor coupling electrode 2223b.
[0542] Moreover, the capacitor coupling electrode 2223a forming the
capacitor with the capacitor coupling electrode 2223b is connected
to the external electrode 2102j (refer to FIG. 46). In addition,
the other end of the strip line 2225 is connected to the capacitor
coupling electrode 2218b, and the capacitor coupling electrode
2218a forming the capacitor with the capacitor coupling electrode
2218b is connected to the external electrode 2102c (refer to FIG.
46).
[0543] The external electrode 2102l (refer to FIG. 46) has the
capacitor coupling electrode 2204 connected thereto, and the
capacitor coupling electrode 2204 is sandwiched between the ground
electrodes 2201 and 2206 to be connected to the ground.
Furthermore, the external electrode 2102l is connected to one end
of the strip line electrode 2212, and the other end of the strip
line electrode 2212 is connected to the capacitor coupling
electrodes 2217a, 2217c and to the anode side of the diode P2003
through the via hole. In addition, the external electrode 2102l
plays a role of the control terminal, and is connected to the
external control circuit.
[0544] The external electrode 2102d (refer to FIG. 46) has the
capacitor coupling electrode 2221 forming the capacitor with the
capacitor coupling electrode 2217c connected thereto. The capacitor
coupling electrode 2217b sandwiched between the capacitor coupling
electrodes 2217a and 2217c is connected to the cathode side of the
diode P2003 (refer to FIG. 46) via the strip line electrode 2226
through the via hole.
[0545] The external electrode 2102b (refer to FIG. 46) has the
capacitor coupling electrode 2222b connected thereto, and the
capacitor coupling electrode 2222a forming the capacitor with the
capacitor coupling electrode 2222b is connected to the anode of the
diode P2004 through the via hole. Moreover, the cathode side of the
diode P2004 is connected to one end of the resistor R2002, and the
other end of the resistor R2002 is connected to the ground from the
external electrode 2102o through the via hole. In addition, the
cathode side of the diode P2004 is connected to the capacitor
coupling electrode 2203 through the via hole, and is connected to
the ground via the ground electrodes 2201 and 2206.
[0546] Furthermore, the capacitor coupling electrode 2222a is
connected to the cathode side of the diode P2003 via the strip line
electrodes 2208a and 2208b through the via hole. Moreover, the
cathode side of the diode P2003 is connected to the capacitor
coupling electrode 2210b through the via hole, and the capacitor
coupling electrode 2210a forming the capacitor with the capacitor
coupling electrode 2210b is connected to the external electrode
2102g through the via hole.
[0547] Furthermore, the external electrodes 2102a, 2102e, 2102h,
2102i, 2102k, 2102m and 2102o (refer to FIG. 46) are connected to
the terminals of the ground electrodes 2201 and 2206 (each has
seven) and 2211 (it has three) in compliance with a predetermined
rule.
[0548] The external electrode 2102f (refer to, FIG. 46) is
connected to the transmitting circuit in the subsequent stage of
GSM, and the external electrode 2102p (refer to FIG. 46) is
connected to the receiving circuit in the subsequent stage of
GSM.
[0549] An external terminal 2102c (refer to FIG. 46) is connected
to the common terminal of the transmitting and receiving signal of
W-CDMA and the transmitting and receiving signal of DCS of the
duplexer of branching the transmitting signal of W-CDMA, the
transmitting and receiving signal of DCS and the receiving signal
of W-CDMA, and an external terminal 2102d (refer to FIG. 46) is
connected to the transmitting circuit in the subsequent stage of
W-CDMA and DCS and an external terminal 2102b (refer to FIG. 46) is
connected to the receiving circuit in the subsequent stage of
DCS.
[0550] An external terminal 2102g (refer to FIG. 46) is connected
to the common terminal of the transmitting signal of W-CDMA and the
transmitting and receiving signal of DCS of the duplexer of
branching the transmitting signal of W-CDMA, the transmitting and
receiving signal of DCS and the receiving signal of W-CDMA, and the
external terminal 2102d (refer to FIG. 46) is connected to the
transmitting circuit in the subsequent stage of W-CDMA and DCS.
Furthermore, an external terminal 2102j is connected to the antenna
terminal.
[0551] It is possible, by using the multilayered substrate using
the dielectrics shown in FIGS. 46 to 48, to implement the smaller
sizes of the branching filter of branching the low frequency band
in the transmitting and receiving frequency band of GSM and the
high frequency bands in the transmitting frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS, the
switching circuit of switching between the transmitting and
receiving of the low frequency band in the transmitting and
receiving frequency band of GSM, and the switching circuit of
switching between the transmitting and receiving of the high
frequency bands in the transmitting frequency band of W-CDMA and
the transmitting and receiving frequency band of DCS of the present
invention.
[0552] Moreover, it is possible to use the strip line electrodes
2209 and 2211 (refer to FIG. 47) as stubs by rendering them n times
longer than wavelengths of the respective transmitting frequencies
thereof so as to improve selectivity of the signals.
[0553] Furthermore, as the ground electrode is formed on the bottom
face, it has an effect that, when mounted on the mobile
communication equipment by the soldering and so on, it can be
shielded from the undesired signals of a mounting substrate or
peripheral circuit parts of the mobile communication equipment.
[0554] In addition, while the strip line has one-layer or two-layer
structure in this embodiment, the same effect can also be obtained
by rendering it as the structure of three or more layers.
[0555] (Eighteenth Embodiment)
[0556] Hereafter, the 3-frequency branching circuit according to an
eighteenth embodiment of the present invention will be described by
referring to FIG. 49, while taking as a concrete example the
circuit of the filter of passing the transmitting frequency bands
and receiving frequency bands of the three frequencies of the GSM
and DCS methods used in the mobile communication in Europe and the
W-CDMA method expected to be introduced in future. Moreover, FIG.
49 shows a circuit diagram of the 3-frequency branching circuit
according to the eighteenth embodiment.
[0557] In FIG. 49, reference numeral 2301 denotes the filter of
which band widths are broad bands such as 880 to 960 MHz as the
transmitting and receiving frequency band of GSM, 1710 to 1980 MHz
as the transmitting frequency band of W-CDMA and the transmitting
and receiving frequency band of DCS, and 2110 to 2170 MHz as the
receiving frequency band of W-CDMA, and having the function of
branching the narrow bands among the bands. 880 to 960 MHz which is
the transmitting and receiving frequency band of GSM is branched by
the low-pass filter having the function of branching the low
frequency band from an antenna terminal 2302 to a first internal
terminal 2303. In addition, 1710 to 1980 MHz which is the
transmitting frequency band of W-CDMA and the transmitting and
receiving frequency band of DCS is branched by the band pass filter
having the function of branching the intermediate frequency band
from the antenna terminal 2302 to a second internal terminal 2304.
And 2110 to 2170 MHz which is the receiving frequency band of
W-CDMA is branched by the high-pass filter having the function of
branching the high frequency band from the antenna terminal 2302 to
a third internal terminal 2305.
[0558] The transmitting and receiving signal of GSM branched by the
low-pass filter is branched into the transmitting signal and
receiving signal of GSM by a first transmitting and receiving
switching circuit (hereafter, also referred to as the first
transmitting and receiving change-over switch) 2306. In addition,
the transmitting signal of W-CDMA and the transmitting and
receiving signal of DCS branched by the band pass filter are
branched into the transmitting signal of W-CDMA, the transmitting
signal of DCS and the receiving signal of DCS by a second
transmitting and receiving switching circuit (hereafter, also
referred to as the second transmitting and receiving change-over
switch) 2307.
[0559] As described above, this embodiment allows the simultaneous
receiving of W-CDMA, GSM and DCS by branching around the antenna
portion (1) the transmitting and receiving of GSM, (2) the
transmitting of the W-CDMA and the transmitting and receiving of
DCS and (3) the receiving of W-CDMA. Furthermore, it can do without
an external matching circuit because the three frequencies are
constituted by one circuit.
[0560] In addition, the transmitting and receiving switching
circuits 2306 and 2307 do not pass the current on receiving of GSM
and DCS not to mention receiving of W-CDMA, leading to reduction in
current consumption. Furthermore, it also has the effect of
rendering the circuit scale smaller, implementing the smaller size
and reducing insertion losses by simultaneously performing the
transmitting of W-CDMA and the transmitting of DCS.
[0561] (Nineteenth Embodiment)
[0562] Next, a nineteenth embodiment of the present invention will
be described by referring to FIGS. 50 to 52.
[0563] The configuration and operation of a coaxial type duplexer
of the 3-frequency branching circuit according to a nineteenth
embodiment of the present invention will be described by using
FIGS. 50 to 52. Moreover, FIG. 50 is an equivalent circuit diagram
of the coaxial type, FIG. 51 is a top view thereof, and FIG. 52 is
a characteristic view thereof.
[0564] In FIG. 50, a W-CDMA receiving terminal 2401 has a first
capacitor C2401 connected to the ground and a first inductor L2401
connected thereto.
[0565] The other end of the first inductor L2401 is connected to a
coaxial type resonator Res2401 via a second capacitor C2402. In
addition, a third capacitor C2403 is connected to the ground and
furthermore, a second inductor L2402 is connected thereto.
[0566] The other end of the second inductor L2402 is connected to a
coaxial type resonator Res2402 via a fourth capacitor C2404. In
addition, a fifth capacitor C2405 is connected to the ground, and a
third inductor L2403 is connected thereto. Moreover, the other end
of the third inductor L2403 is connected to an antenna terminal
2402 to be connected to the antenna.
[0567] A W-CDMA transmitting and DCS transmitting and receiving
terminal 2403 has a sixth capacitor C2406 connected thereto, and
the other end of the sixth capacitor C2406 is connected to a
coaxial type resonator Res2403 in parallel, and is connected to a
seventh capacitor C2407 and further to an eighth capacitor
C2408.
[0568] The other end of the eighth capacitor C2408 is connected to
a coaxial type resonator Res2404 in parallel, and is connected to a
ninth capacitor C2409. The other end of the ninth capacitor C2409
is connected to a coaxial type resonator Res2405 in parallel, and
is connected to the other end of the seventh capacitor C2407 and
further to a tenth capacitor C2410 and to the antenna terminal
2402.
[0569] A GSM transmitting and receiving terminal 2404 is connected
to an eleventh capacitor C2411 connected to the ground, and is also
connected to a fourth inductor L2404.
[0570] The other end of the fourth inductor L2404 has a twelfth
capacitor C2412 connected to the ground, and also has a fifth
inductor L2405 connected thereto.
[0571] The other end of the fifth inductor L2405 is connected to
the antenna terminal 2402 to be connected to the antenna.
[0572] The configuration of the coaxial type comprised of the
equivalent circuit as above will be described by using FIG. 51.
[0573] In FIG. 51, a wiring substrate P2501 is made of glass epoxy
and so on. Moreover, coaxial type resonators Res2401 to 2405 (refer
to FIG. 50) are made of dielectrics and so on, and are mounted on
the wiring substrate P2501 by the soldering and so on together with
the inductor elements such as the air core coil and chip
capacitor.
[0574] External terminals 2501, 2502, 2503, 2504, 2505, 2506, 2507,
2508, 2509 and 2510 are provided on the wiring substrate P2501. In
addition, the external terminals 2501 is connected to the receiving
terminal of W-CDMA, the external terminals 2509 to the antenna
terminal, the external terminals 2507 to the transmitting and
receiving terminal of GSM, and the external terminals 2508 to the
transmitting terminal of W-CDMA and the transmitting and receiving
terminal of DCS respectively, and the external terminals 2502,
2503, 2504, 2505, 2506 and 2510 have the ground terminals placed
thereon.
[0575] In FIG. 52, the waveform 1 is a waveform diagram of the
transmitting and receiving signal of GSM. In the waveform 1, the
transmitting and receiving frequency band of GSM is passed by using
the low-pass filter. In addition, the selectivity is improved by
attenuating the transmitting and receiving frequency band of W-CDMA
and the transmitting and receiving frequency band of DCS.
[0576] The waveform 2 is a waveform diagram of the transmitting
signal of W-CDMA and the transmitting and receiving signal of DCS.
In the waveform 2, the transmitting frequency band of W-CDMA and
the transmitting and receiving frequency band of DCS are passed by
using the band pass filter. Moreover, the selectivity is improved
by attenuating the transmitting and receiving frequency band of GSM
and the receiving frequency band of W-CDMA.
[0577] The waveform 3 is a waveform diagram of the receiving signal
of W-CDMA. In the waveform 3., the receiving frequency band of
W-CDMA is passed by using the notch filter. Moreover, the
selectivity is improved by attenuating the transmitting and
receiving frequency band of GSM, the transmitting frequency band of
W-CDMA and the transmitting and receiving frequency band of
DCS.
[0578] As described above, it is possible, according to this
embodiment, to reduce the insertion losses of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA, the
transmitting and receiving signal of DCS and the receiving signal
of W-CDMA by using the duplexer and using the coaxial type.
[0579] (Twentieth Embodiment)
[0580] Next, a twentieth embodiment of the present invention will
be described by referring to the drawings. Moreover, FIGS. 53 to 55
are a perspective view, an exploded perspective view and an
equivalent circuit diagram of the multilayered product constituting
the 3-frequency branching circuit according to the twentieth
embodiment of the present invention.
[0581] In FIG. 53, a multilayered product 2701 of the 3-frequency
branching circuit is formed by a large number of the dielectric
layers, and external electrodes 2702, 2703, 2704, 2705, 2706, 2707,
2708, 2709, 2710, 2711, 2712 and 2713 are provided on and in the
proximity of the sides of the multilayered product 2701.
[0582] The configuration and circuit will be described in detail by
referring to FIGS. 54 and 55.
[0583] The layer A in FIG. 54 has a first ground electrode 2801
formed therein. In addition, the layer B has first, second, third,
fourth and fifth resonator electrodes 2802, 2803, 2804, 2805 and
2806 formed therein, and furthermore, the layer C has first and
second capacitor coupling electrodes 2807 and 2808 formed
therein.
[0584] The layer D has third, fourth, fifth, sixth and seventh
capacitor coupling electrodes 2809, 2810, 2811, 2812 and 2816 and
first, second, third and fourth strip line electrodes 2813, 2814,
2815 and 2817 formed therein.
[0585] The layers E, F and G have eighth, ninth, tenth, eleventh
and twelfth capacitor coupling electrodes 2818, 2819, 2820, 2821
and 2822 formed therein. Furthermore, the layer H has a second
ground electrode 2823 formed therein.
[0586] The external electrode 2711 (refer to FIG. 53) is the
receiving terminal of W-CDMA, and the external electrode 2811
(refer to FIG. 54) has the strip line electrode 2814 connected
thereto. Furthermore, the external electrode 2811 is connected to
the ground by the ground electrode 2823 (refer to FIG. 54) via the
capacitor coupling electrode 2822.
[0587] One end of the strip line electrode 2814 is connected to one
end of the capacitor coupling electrode 2812, and the capacitor
coupling electrode 2812 is connected to the resonator electrode
2802 via the layers C and D.
[0588] The other end of the capacitor coupling electrode 2812 is
connected to one end of the capacitor coupling electrode 2811, and
the capacitor coupling electrode 2811 is connected to the resonator
electrode 2803 via the layers C and D.
[0589] The other end of the capacitor coupling electrode 2811 is
connected to one end of the strip line electrode 2813, and one end
of the strip line electrode 2813 is connected to one end of the
capacitor coupling electrode 2820 (refer to FIG. 54) via the layers
E and F. The other end of the capacitor coupling electrode 2820 is
connected to the ground by the external electrode 2713 (refer to
FIG. 53) , and furthermore, the other end of the strip line
electrode 2813 is connected to the external electrode 2702 (refer
to FIG. 53) which is the antenna terminal so as to form the notch
filter structure.
[0590] The external electrode 2705 (refer to FIG. 53) is the DCS
transmitting and receiving and W-CDMA transmitting terminal, and is
connected to one end of the capacitor coupling electrode 2818. The
capacitor coupling electrode 2818 is connected to the resonator
electrode 2804 via the layers C, D and E.
[0591] The resonator electrode 2804 is connected to the capacitor
coupling electrode 2807 via the layer C, and the capacitor coupling
electrode 2807 is connected to the resonator electrode 2805 via the
layer C. In addition, the resonator electrode 2805 is connected to
the capacitor coupling electrode 2808 via the layer C, and the
capacitor coupling electrode 2808 is connected to the resonator
electrode 2806 via the layer C. Furthermore, the capacitor coupling
electrode 2807 is connected to the capacitor coupling electrode
2808 via the layer D.
[0592] The resonator electrode 2806 is connected to the capacitor
coupling electrode 2810 via the layers C and D, and the capacitor
coupling electrode 2810 is connected to the external electrode 2702
(refer to FIG. 53) which is the antenna terminal so as to form the
band-pass filter structure.
[0593] The external electrode 2708 (refer to FIG. 53) is the GSM
transmitting and receiving terminal, and the external electrode
2708 is connected to one end of the capacitor coupling electrode
2821, and the capacitor coupling electrode 2821 has the ground
electrode 2823 (refer to FIG. 54) connected thereto via the layers
G and H. Furthermore, the external electrode 2708 has the strip
line electrode 2817 connected thereto, and the other end of the
strip line electrode 2817 is connected to the capacitor coupling
electrode 2816, and is connected to the capacitor coupling
electrode 2819 (refer to FIG. 54) via the layer E. In addition, the
capacitor coupling electrode 2819 is connected to the ground via
the external electrode 2706 (refer to FIG. 53).
[0594] The capacitor coupling electrode 2816 is connected to the
strip line electrode 2815, and the other end of the strip line
electrode 2815 is connected to the external electrode 2702 (refer
to FIG. 53) which is the antenna terminal so as to form the
low-pass filter structure. Moreover, the external electrodes 2703,
2704, 2706, 2707, 2709, 2710, 2712 and 2713 (refer to FIG. 53) form
the ground electrode.
[0595] As described above, according to this embodiment, it is
possible to implement the smaller size by using the layered type
duplexer.
[0596] Moreover, this embodiment was described in detail by taking
the layered type duplexer as an example, but it is also possible to
implement the smaller size by using the SAW (surface acoustic wave)
filter as the duplexer. In addition, it is also possible, according
to the requirement characteristics, to implement it by combining
the coaxial type, layered type and SAW filter.
[0597] Moreover, as for the branching circuit of the present
invention in the above-mentioned sixth to fourteenth embodiments,
the first internal terminal 103 is the terminal of inputting the
transmitting frequency band of W-CDMA and inputting and outputting
the transmitting frequency bands and receiving frequency bands of
DCS and GSM, and is the 3-frequency branching circuit having the
first switching circuit 106 of switching between the input of the
transmitting frequency band of GSM and the output of the receiving
frequency band of GSM branched by a branching circuit 105 and the
second switching circuit 107 of switching between the input of the
transmitting frequency band of W-CDMA and the transmitting
frequency band of DCS and the output of the receiving frequency
band of DCS branched by a branching circuit 105. However, the
branching circuit of the present invention is not limited thereto,
but it may also be the branching circuit characterized by having a
first branching means having the filter function of passing the
transmitting frequency band and the receiving frequency band in
each of the first to Nth frequency bands and equipped with the
first to the k-th internal terminals and the antenna terminal of
connecting to the antenna, for instance, wherein the first internal
terminal is the terminal of inputting the transmitting frequency
band of the first frequency band, and also having a second
branching means, connected to the k-th internal terminal, of
branching the transmitting frequency bands of the first frequency
band and all or a part of the second to N-th frequency bands.
[0598] In addition, as for the branching circuit of the present
invention in the above-mentioned eighteenth to twentieth
embodiments, the second internal terminal 2304 is the terminal of
inputting the transmitting frequency band of W-CDMA and inputting
and outputting the transmitting frequency band and receiving
frequency band of DCS and the first internal terminal 2303 is the
terminal of inputting and outputting the transmitting frequency
band and the receiving frequency band of GSM, and it is the
3-frequency branching circuit having the second switching circuit
2307, connected to the second internal terminal 2304, of switching
between the input of the transmitting frequency band of W-CDMA and
the transmitting frequency band of DCS and the output of the
receiving frequency band of DCS and the first switching circuit
2306, connected to the first internal terminal 2303, of switching
between the input of the transmitting frequency band of GSM and the
output of the receiving frequency band of GSM.
[0599] In short, the branching circuit of the present invention
should be the branching circuit characterized by having first
branching means having the filter function of passing the
transmitting frequency band and the receiving frequency band in
each of the first to Nth frequency bands and equipped with the
first to the k-th internal terminals and the antenna terminal of
connecting to the antenna, wherein the first internal terminal is
the terminal of outputting the receiving frequency band of the
first frequency band, and the k-th internal terminal is the
input/output terminal of inputting the transmitting frequency band
of the first frequency band and inputting and outputting the
transmitting frequency bands and the receiving frequency bands of
all or a part of the second to N-th frequency bands.
[0600] In addition, the branching circuit of the present invention
may also be the branching circuit having replaced the roles of the
input and output in such a branching circuit. To be more specific,
the branching circuit of the present invention may also be the
branching circuit characterized by having first branching means
having the filter function of passing the transmitting frequency
band and the receiving frequency band in each of the first to Nth
frequency bands and equipped with the first to the k-th internal
terminals and the antenna terminal of connecting to the antenna,
wherein the first internal terminal is the terminal of inputting
the transmitting frequency band of the first frequency band, and
the k-th internal terminal is the input/output terminal of
outputting the receiving frequency band of the first frequency band
and inputting and outputting the transmitting frequency bands and
the receiving frequency bands of all or a part of the second to
N-th frequency bands.
[0601] As for the branching circuit of the present invention in the
case of taking the circuit configuration described above, the
receiving signal (or transmitting signal) to the first internal
terminal is branched first by the first branching means around the
antenna, and so the receiving signal can be received in a low-loss
state so that high tone quality of the receiving signal (or
transmitting signal) can be assured for instance.
[0602] In addition, as it can simultaneously transmit and receive
the signal by utilizing the first internal terminal which is the
terminal dedicated to the receiving signal (or transmitting
signal), it also supports the system in which the W-CDMA (Wide-band
Code Division Multiple Access) method is mixed. As a matter of
course, a plurality of such terminals dedicated to the receiving
signal (or transmitting signal) may be provided so that high tone
quality of the receiving signal (or transmitting signal) on each
terminal can be assured for instance.
[0603] Moreover, as for the branching circuit of the present
invention, it goes without saying that it is possible, by further
having an arbitrary number of the branching means in the subsequent
stage of the aforementioned first and/or second branching means, to
branch the receiving frequency bands and the transmitting frequency
bands in an arbitrary number of the frequency bands.
[0604] In addition, as for the branching circuit according to the
above-mentioned fifteenth to seventeenth embodiments of the present
invention, the fourth internal terminal 1907 is the terminal of
inputting the transmitting frequency band of W-CDMA and inputting
and outputting the transmitting frequency band and the receiving
frequency band of DCS, and is the 3-frequency branching circuit
having a first switching circuit 1904, connected to the first
internal terminal 1903, of switching between the input of the
transmitting frequency band of GSM and the output of the receiving
frequency band of GSM and a second switching circuit 1909,
connected to the fourth internal terminal 1907, of switching
between the input of the transmitting frequency band of W-CDMA and
the transmitting frequency band of DCS and the output of the
receiving frequency band of DCS.
[0605] However, the branching circuit of the present invention is
not limited thereto, but it may also be, for instance, the
branching circuit characterized by having the first branching means
having the filter function of passing the transmitting frequency
band and receiving frequency band in each of the first to Nth
frequency bands and equipped with the first and second internal
terminals and the antenna terminal of connecting to the antenna,
and the second branching means having the filter function of
passing the transmitting frequency band and receiving frequency
band in each of the first to N-1-th frequency bands and equipped
with the connection terminals of connecting to the third to the
k-th internal terminals and to the second internal terminal, and
the third branching means, connected to the third internal
terminal, of branching the transmitting frequency band in the first
frequency band and the frequency bands of all or a part of the
second to N-th frequency bands.
[0606] In short, the branching circuit of the present invention
should be the branching circuit characterized by having the first
branching means having the filter function of passing the
transmitting frequency band and the receiving frequency band in
each of the first to Nth frequency bands and equipped with the
first and second internal terminals and the antenna terminal of
connecting to the antenna and the second branching means having the
filter function of passing the transmitting frequency band and
receiving frequency band in each of the first to N-1-th frequency
bands and equipped with the third to the k-th internal terminals
and the connection terminal of connecting to the second internal
terminal, wherein the first internal terminal is the terminal of
inputting and outputting the transmitting frequency band and the
receiving frequency band of the N-th frequency band, the second
internal terminal is the terminal of inputting and outputting the
transmitting frequency band and the receiving frequency band of the
first to N-1-th frequency band, and the k-th internal terminal is
the terminal of outputting the receiving frequency band of the
first frequency band, and the third internal terminal is the
input/output terminal of inputting the transmitting frequency band
of the first frequency band and inputting and outputting the
transmitting frequency bands and the receiving frequency bands of
all or a part of the second to N-1-th frequency bands.
[0607] In addition, the branching circuit of the present invention
may also be the branching circuit having replaced the roles of the
input and output in such a branching circuit. To be more specific,
the branching circuit of the present invention may also be the
branching circuit characterized by having the first branching means
having the filter function of passing the transmitting frequency
band and the receiving frequency band in each of the first to Nth
frequency bands and equipped with the first and second internal
terminals and the antenna terminal of connecting to the antenna,
the second branching means having the filter function of passing
the transmitting frequency band and the receiving frequency band in
each of the first to N-1-th frequency bands and equipped with the
third to k-th internal terminals and the connection terminal of
connecting to the second internal terminal, wherein the first
internal terminal is the terminal of inputting and outputting the
transmitting frequency band and the receiving frequency band of the
N-th frequency band, the second internal terminal is the terminal
of inputting and outputting the transmitting frequency band and the
receiving frequency band of the first to N-1-th frequency band, and
the k-th internal terminal is the terminal of inputting the
transmitting frequency band of the first frequency band, and the
third internal terminal is the terminal of outputting the receiving
frequency band of the first frequency band and inputting and
outputting the transmitting frequency bands and the receiving
frequency bands of all or a part of the second to N-1-th frequency
bands.
[0608] As for the branching circuit of the present invention in the
case of taking the circuit configuration described above, the
transmitting and receiving signal to the first internal terminal is
branched first by the first branching means around the antenna
portion, and so the transmitting and receiving signal can be
received in a low-loss state so that the high tone quality thereof
can be assured for instance. As a matter of course, a plurality of
terminals dedicated to the transmitting and receiving signals of a
plurality of connection methods may be provided so that the high
tone quality of the transmitting and receiving signals of the
plurality of connection methods can be assured for instance.
[0609] In addition, as it can simultaneously transmit and receive
the signal by utilizing the k-th internal terminal which is
dedicated to outputting the receiving frequency band of the first
frequency band (or inputting the transmitting frequency band of the
first frequency band) it also supports the system in which the
W-CDMA (Wide-band Code Division Multiple Access) method is mixed.
As a matter of course, a plurality of such terminals dedicated to
the receiving signal (or the transmitting signal) may be provided
so that high tone quality of the receiving signal (or the
transmitting signal) on each terminal can be assured for
instance.
[0610] Moreover, as for the branching circuit of the present
invention, it goes without saying that it is possible, by further
having an arbitrary number of the branching means in the subsequent
stage of the aforementioned first. and/or second branching means
and/or third branching means, to branch the receiving frequency
bands and the transmitting frequency bands in an arbitrary number
of the frequency bands.
[0611] In addition, the mobile communication equipment (radio
communication equipment) of the present invention is characterized
by having the antenna of transmitting and receiving the signal, the
branching circuit of the present invention (3-frequency branching
circuit) of inputting and outputting the transmitted and received
signal, and the signal processing means of processing the signal
branched by the branching circuit (3-frequency branching
circuit).
[0612] Thus, the present invention allows the simultaneous
receiving of W-CDMA, GSM and DCS by, for instance, using the
duplexer around the antenna portion so as to branch the W-CDMA
receiving signal first and branch the GSM transmitting and
receiving signal from the W-CDMA transmitting signal and the DCS
transmitting and receiving signal by using the branching circuit of
branching the low frequency band and high frequency band.
Furthermore, it is possible to provide the low-pass filter of
passing the low frequency through the common terminal of the
transmitting and receiving signal of GSM, the transmitting signal
of W-CDMA and transmitting and receiving signal of DCS and the
high-pass filter of passing the high frequency through it, and
provide the circuit of dividing the transmitting and receiving
signals of GSM on the low-pass filter side, and also provide the
circuit of dividing the transmitting and receiving as to the
transmitting signals of W-CDMA and DCS and the transmitting signal
of DCS on the high-pass filter side so as to allow the transmitting
and receiving of the three frequencies. In addition, it is
possible, according to the requirement characteristics, to
implement the 3-frequency branching circuit of the smaller size and
reduced losses by using in the duplexer portion the coaxial type
duplexer using the coaxial type resonator if reduction in losses is
required, the duplexer of the layered type or using the SAW filter
if the smaller size is required, and further combining them.
[0613] In addition, it is also possible to implement the
transmitting and receiving of the three frequencies by providing in
the antenna portion the low-pass filter of passing the low
frequency through the common terminal of the transmitting and
receiving signal of GSM, the transmitting signal of W-CDMA and
transmitting and receiving signal of DCS and the high-pass filter
of passing the high frequency through it, and providing the circuit
of dividing the transmitting and receiving signals of GSM on the
low-pass filter side and also providing the circuit of dividing the
transmitting and receiving as to the transmitting signals of W-CDMA
and DCS and the receiving signal of DCS on the high-pass filter
side, and it is also feasible to provide the 3-frequency branching
circuit of the smaller size and reduced losses by using the
aforementioned coaxial type duplexer and the layered and SAW
filter.
[0614] Moreover, the entire disclosure of the above literature is
quoted as-is so as to be integrated herein.
[0615] Industrial Applicability
[0616] As is apparent from the above description, the present
invention has an advantage that it can provide the 3-frequency
branching circuit, branching circuit and radio communication
equipment also usable for the system wherein the TDMA method and
the W-CDMA method assuring high tone quality and high speed data
communication for instance are mixed.
* * * * *